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It is the additional amount of heat [measured in (the "big") calories ] required to cause boiling/vaporization of a liquid already at the boiling/vaporization temperature. Heat of vaporization is the amount of heat (540 calories/gram) needed to change a specific amount of liquid (1 gram) at it's boiling point into a gas without changing it's temperature. -Qwasas
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∙ 15y ago
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∙ 12y agoThe enthalpy of vaporization, (symbolΔHvap), also known as the heat of vaporization or heat of evaporation, is theenergy required to transform a given quantity of a substance into a gas at a given pressure (often atmospheric pressure).
It is often measured at the normal boiling pointof a substance; although tabulated values are usually corrected to 298 K, the correction is often smaller than the uncertainty in the measured value.
The heat of vaporization is temperature-dependent, though a constant heat of vaporization can be assumed for small temperature ranges and below Tr<<1.0. The heat of vaporization diminishes with increasing temperature and it vanishes completely at the critical temperature (Tr=1) because above the critical temperature the liquid andvapor phases no longer co-exist.
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∙ 6y agoEnthalpy of vaporization is the energy required at constant pressure and temperature to convert I mole of a liquid to a gas at that pressure and temperature. Note that you can have vaporization at pretty much any temperature where a liquid can exist - not just at the boiling point. Obviously water does not have to be boiling to evaporate - or the road would never dry out after it rains.
anon
The energy required to go from a liquid to a gas (apex 2022)
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∙ 9y agoThe latent heat of vaporization is what is commonly referred to as boiling. This is the amount of energy require to change from a state of liquid to vapor.
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∙ 13y agoVaporization heat of water: 40.65 kJ/mol or 2257 kJ/kg
or
539.423 calories per gram (very outdated units!)
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∙ 9y agoIt means how much heat energy is required, per unit mass (or per mole), to convert a substance from liquid to gas.
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The amount of energy needed to change a material from a solid to a liquid is the heat of what?
The latent heat of evaporation
What is the amount of energy required to change a material from a liquid to a gas?
Latent Heat of Evaporation, or Evaporation Enthalpy. It is given in units of energy over unit of mass, i.e., KJ/Kg.
Swamp coolers are effective because?
the water's latent heat of vaporization is being pulled from the air, the water pulls heat from the room to undergo a phase change.
Which biological process uses the latent heat vaporization of water?
i think d...................... what you mean
What is the name of heat energy that changes ice into water and water into steam?
Latent heat is the measurement of energy needed to change the state of a substance at its melting point or boiling point. The latent heat of fusion of water is the amount of energy needed to change a fixed amount of water from a solid to liquid at 0 degrees C. this works out to be more than 800KJ of heat energy. The latent heat of vaporization of water is the amount of energy needed to change a fixed amount of water from a liquid to a gas at 100 degrees C. this is more than 1200KJ of heat needed to be absorbed.
The amount of energy needed to change a material from a solid to a liquid is the heat of what?
The latent heat of evaporation
What is the electrical method to determine the specific latent heat of vaporisation?
coclude the specific latent heat of vaporization
What is the latent of vaporization?
The latent heat of vaporization is what is commonly referred to as boiling. This is the amount of energy require to change from a state of liquid to vapor.
What does the heat latent heat of vaporization measure?
The energy required to boil a substance
What is the Latent heat of vaporization for ethyl acetate?
87.6kcal/kg
What step changes liquid water to water vapor?
Vaporization is the change of liquid water to water vapor. Vaporization requires addition of the latent heat of vaporization to liquid water. The latent heat of vaporization supplies the liquid water molecules with enough energy to become vapor molecules. The latent heat of vaporization at 1.0 atmosphere pressure is about 1000 Btu per lbm ( 2260 kJ per kg ).
What is the value of latent heat of vaporization of water?
2260 kJ/kg
How your body cooled when you perspire?
Perspiration coats the outside of the skin with moisture (water). The water evaporates. Evaporation requires heat to be absorbed by the water (the latent heat of vaporization). Heat is removed from the body surface to provide the water with the latent heat of vaporization.
Why does the temperature stops rising during melting and boiling point?
Because the latent heat of fusion and latent heat of vaporization are very high
What does the latent heat of vaporization represent?
The amount of energy required to turn a mole of a liquid into a gas
What appliances make use of latent heat of vaporization?
Refrigerator, freezer and air conditioner.
What does L mean in the equation Heat equals mL?
L can either mean the latent heat of vaporization or condensation. The latent heat of vaporization is the energy required to completely turn 1 kilogram of a liquid into a gas at its boiling point. The latent heat of condensation is the energy required to completely turn 1 kilogram of a solid into a liquid at its melting point.
