absorbs

Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Pure water-free acetic acid is a colourless hygroscopic liquid (that is, it readily absorbs water) that freezes below 16.7 °C (62 °F) to a colourless crystalline solid. Acetic acid is corrosive, and its vapour is irritating to eyes and nose, although it is a weak acid based ...

Including:

• Acetic acid - Nomenclature
• Acetic acid - History
• Acetic acid - Chemical properties
• Acetic acid - Biochemistry
• Acetic acid - Production
• Acetic acid - Methanol carbonylation
• Acetic acid - Acetaldehyde oxidation
• Acetic acid - Ethylene oxidation
• Acetic acid - Fermentation
• Acetic acid - Applications
• Acetic acid - Vinyl acetate monomer
• Acetic acid - Acetic anhydride
• Acetic acid - Ester production
• Acetic acid - Vinegar
• Acetic acid - Use as solvent
• Acetic acid - Other applications
• Acetic acid - Safety

Read more here: » Acetic acid: Encyclopedia - Acetic acid

In analytical chemistry, the molar absorptivity or molar extinction coefficient ε of a chemical species at a given wavelength is a measure of how strongly the species absorbs light at that wavelength. It is an intrinsic property of the species; the actual absorbance of a sample is dependent on its thickness L and the concentration c of the species. When there is more than one absorbing species in a solution, the absorbance is the sum of the absorbances for each individual species. The absorbance at a given wavelength of a mixtu ...

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The invention of the light bulb is usually attributed in Britain to Joseph Wilson Swan and in the United States to Thomas Alva Edison (who first marketed the device successfully). However, it is now believed that Heinrich Göbel built functional bulbs three decades earlier. Alexander Nikolayevich Lodygin developed an incandescent light bulb around the same time. Many others also had a hand in the development of a practical device for the production of elect ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - History of the light bulb

Light is made up of particles called photons and hence inherently is "grainy" (quantized); quantum optics is the study of the nature and effects of this. The first indication that light might be quantized came from Max Planck in 1899 when he correctly modelled blackbody radiation by assuming that the exchange of energy between light and matter only occurred in discrete amounts he called quanta. It was unknown whether the source of this discreteness was the matter or the light. In 1905, Albert Einstein published the theory of the photoelectri ...

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Quantum optics, Quantum optics - History of quantum optics, Quantum optics - Concepts of quantum optics

Read more here: » Quantum optics: Encyclopedia II - Quantum optics - History of quantum optics

Infrared - Night vision. Infrared is used in night-vision equipment, when there is insufficient visible light to see an object. The radiation is detected and turned into an image on a screen, hotter objects showing up brighter, enabling the police and military to acquire thermally significant targets, such as human beings and automobiles. Also see Forward looking infrared. Smoke is more transparent to infrared than to visible light, so firefighters use infrared imaging equipment when working in smoke-filled areas. < ...

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Infrared, Infrared - The Earth as an infrared emitter, Infrared - Applications, Infrared - Night vision, Infrared - Other imaging, Infrared - Thermography, Infrared - Heating, Infrared - Communications, Infrared - Spectroscopy, Infrared - History, Infrared - Biological systems, Infrared - Human history

Read more here: » Infrared: Encyclopedia II - Infrared - Applications

The invention of the light bulb is usually attributed in Britain to Joseph Wilson Swan and in the United States to Thomas Alva Edison (who first marketed the device successfully). However, it is now believed that Heinrich Göbel built functional bulbs three decades earlier. Alexander Nikolayevich Lodygin developed an incandescent light bulb around the same time. Many others also had a hand in the de ...

See also:

Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and life, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - History of the light bulb

Mainly for educational use, or where the design of a building does not permit the fitting of external ductwork, these units generally have a fan mounted on the top (soffit) of the hood, or beneath the worktop. Air is sucked through the front opening of the hood and through a filter, before passing through the fan and being fed back into the workplace. Fume hood - Pre-Filtration. The first stage of filtration consists of a physical barrier, typically of open cell foam, which prevents large particles from passing through. A filter of this type is generally inexpensive, and would ...

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Fume hood, Fume hood - Construction and location, Fume hood - Recirculating Fume Hoods, Fume hood - Pre-Filtration, Fume hood - Main Filtration, Fume hood - Ducted Fume Hoods, Fume hood - Specific Fume Hood Types, Fume hood - Use, Fume hood - Control Panels, Fume hood - A warning

Read more here: » Fume hood: Encyclopedia II - Fume hood - Recirculating Fume Hoods

Acetic acid is produced both synthetically and by bacterial fermentation. Today, the biological route accounts for only about 10% of world production, but it remains important for vinegar production, as in much of the world food purity laws stipulate that vinegar used in foods must be of biological origin. About 75% of acetic acid made for use in the chemical industry is made by methanol carbonylation, explained below. Alternative methods account for the rest.^{See also:}

Acetic acid, Acetic acid - Nomenclature, Acetic acid - History, Acetic acid - Chemical properties, Acetic acid - Biochemistry, Acetic acid - Production, Acetic acid - Methanol carbonylation, Acetic acid - Acetaldehyde oxidation, Acetic acid - Ethylene oxidation, Acetic acid - Fermentation, Acetic acid - Applications, Acetic acid - Vinyl acetate monomer, Acetic acid - Acetic anhydride, Acetic acid - Ester production, Acetic acid - Vinegar, Acetic acid - Use as solvent, Acetic acid - Other applications, Acetic acid - Safety

Read more here: » Acetic acid: Encyclopedia II - Acetic acid - Production

Incandescent lamps are very sensitive to changes in the supply voltage. These characteristics are of great practical and economic importance. For a supply voltage V, Light output is approximately proportional to V3.4 Power consumption is approximately proportional to V1.6 Lifetime is approximately inversely proportional to V16 Color te ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Voltage light output and lifetime

Most incandescent light bulbs waste about 98% of the power they consume in heat. An incandescent light bulb (about 2.1% efficiency) is about one quarter as efficient as a fluorescent lamp (about 8.2% efficiency), and produces about six times as much heat with the same amounts of light from both sources. One reason why incandescent lamps are unpopular in commercial spaces is because the heat output results in the need for more air conditioning in the summer. Incandescent lamps can usually be replaced by self-ballasted compact fl ...

See also:

Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Heat

Infrared - Biological systems. The pit viper is known to have two infrared sensory pits on its head. There is controversy over the exact thermal sensitivity of this biological infrared detection system. Thermal Modeling of Snake Infrared Reception: Evidence for Limited Detection Range, B. S. Jones, W. F. Lynn and M. O. Stone, Journal of Theoretical Biology Vol. 209, Iss. 2, 201-211 (2001) DOI:10.1006/jtbi.2000.2256 Biological Thermal Detection: Micromechanical and Microthermal Properties of ...

See also:

Infrared, Infrared - The Earth as an infrared emitter, Infrared - Applications, Infrared - Night vision, Infrared - Other imaging, Infrared - Thermography, Infrared - Heating, Infrared - Communications, Infrared - Spectroscopy, Infrared - History, Infrared - Biological systems, Infrared - Human history

Read more here: » Infrared: Encyclopedia II - Infrared - History

Most domestic and industrial light bulbs have standard fittings compatible with standard lampholders. The most common types of fitting are: E12 or candelabra MES or medium Edison screw (aka E26), used in the USA and Japan for most 120 and 100 volt lamps BC or B22 or double-contact bayonet cap, used in the UK, Ireland and Australia for most 240 volt mains lamps (although MES is also common in the UK) E14 / E27 screw fittings, used in continental Eu ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Standard fittings

Incandescent light bulbs are usually marketed according to the electrical power consumed. This is measured in watts and depends mainly on the resistance of the filament, which in turn depends mainly on the filament's length, thickness and material. It is difficult for the average consumer to predict the light output of a bulb given the power consumed but it can be safely assumed, for two bulbs of the s ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Power

Most domestic and industrial light bulbs have standard fittings compatible with standard lampholders. The most common types of fitting are: E12 or candelabra MES or medium Edison screw (aka E26), used in the USA and Japan for most 120 and 100 volt lamps BC or B22 or double-contact bayonet cap, used in the UK, Ireland and Australia for most 240 volt mains lamps (although MES is also common in the UK) E14 / E27 screw fittings, used in continental ...

See also:

Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Standard fittings

A kilowatt-hour is a unit of energy, and in the United States this is the unit in which electricity is purchased. The cost of electricity in the United States ranges from $0.08 to $0.12 per kilowatt-hour. The following shows how to calculate total cost of electricity for using an incandescent light bulb over a compact fluorescent light bulb. (Also note that 1 kW-hour is the same as 1000 W-hours). Electricity Cost (for cost of $0.10 per kW·h) < ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Comparison of electricity cost

The problem of short lamp life is addressed with the halogen lamp, also called the tungsten-halogen lamp, where a tungsten filament is sealed into a clear "capsule" filled with a halogen gas such as iodine or bromine. This creates an equilibrium reaction where the tungsten filament that evaporates when giving off light is chemically re-deposited at the hot-spots, preventing the early failure of the lamp. This also allows halogen lamps to be run at higher temperatures (which would cause unacceptably low lamp lifetimes in ordinary incandescent lamps) allowing for g ...

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Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - The halogen lamp

A light can waste power by emitting too much light outside of the visible spectrum. Only visible light is useful for illumination, and some wavelengths are perceived as brighter than others. Taking this into account, luminous efficacy is a ratio of the useful power emitted to the total power and is measured in lumens per watt (lm/W). The maximum efficacy possible is 683 lm/W. Luminous efficiency is luminous efficacy divided by this maximum and so is expressed as a number between 0 and 1 or as a percentage[1]. However, the ...

See also:

Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and lifetime, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Efficacy and efficiency

Most incandescent light bulbs waste about 98% of the power they consume in heat. An incandescent light bulb (about 2.1% efficiency) is about one quarter as efficient as a fluorescent lamp (about 8.2% efficiency), and produces about six times as much heat with the same amounts of light from both sources. One reason why incandescent lamps are unpopular in commercial spaces is because the heat output results in the need for more air conditioning in the summer. Incandescent lamps can usually be replaced by self-ballasted compact fl ...

See also:

Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and life, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Heat

A light can waste power by emitting too much light outside of the visible spectrum. Only visible light is useful for illumination, and some wavelengths are perceived as brighter than others. Taking this into account, luminous efficacy is a ratio of the useful power emitted to the total power and is measured in lumens per watt (lm/W). The maximum efficacy possible is 683 lm/W. Luminous efficiency is luminous efficacy divided by this maximum and so is expressed as a number between 0 and 1 or as a percentage[1]. However, the ...

See also:

Incandescent light bulb, Incandescent light bulb - History of the light bulb, Incandescent light bulb - The halogen lamp, Incandescent light bulb - Comparison of electricity cost, Incandescent light bulb - Standard fittings, Incandescent light bulb - Efficacy and efficiency, Incandescent light bulb - Power, Incandescent light bulb - Voltage light output and life, Incandescent light bulb - Heat

Read more here: » Incandescent light bulb: Encyclopedia II - Incandescent light bulb - Efficacy and efficiency

The acetyl group, derived from acetic acid, is fundamental to the biochemistry of virtually all forms of life. When bound to coenzyme A it is central to the metabolism of carbohydrates and fats. However, the concentration of free acetic acid in cells is kept at a low level to avoid disrupting the control of the pH of the cell contents. Unlike some longer-chain carboxylic acids (the fatty acids), acetic acid does not occur in natural triglycerides. However, the artificial triglyceride triacetin (glycerin triacetate) is a common food additive, and ...

See also:

Acetic acid, Acetic acid - Nomenclature, Acetic acid - History, Acetic acid - Chemical properties, Acetic acid - Biochemistry, Acetic acid - Production, Acetic acid - Methanol carbonylation, Acetic acid - Acetaldehyde oxidation, Acetic acid - Ethylene oxidation, Acetic acid - Fermentation, Acetic acid - Applications, Acetic acid - Vinyl acetate monomer, Acetic acid - Acetic anhydride, Acetic acid - Ester production, Acetic acid - Vinegar, Acetic acid - Use as solvent, Acetic acid - Other applications, Acetic acid - Safety

Read more here: » Acetic acid: Encyclopedia II - Acetic acid - Biochemistry