heat definitions Flashcards
temperature
temperature is a measure of the hotness or coldness of a body
heat
heat is a form of energy
thermometric property
a thermometric property is a physical property that changes measurably with temperature
heat capacity
the heat capacity is the heat energy needed to raise the temperature of a substance by 1K
specific heat capacity
specific heat capacity of a substance is the heat energy needed to change 1Kg of the substance by 1K
latent heat
the latent heat is the heat energy needed to change the state of a substance without changing the temperature
specific latent heat
the specific latent heat of a substance is the heat energy needed to change the state of 1Kg of the substance without a change in temperature
specific latent heat of fusion
the specific latent heat of fusion of a substance is the amount of heat energy required to change 1Kg of the substance from a solid to a liquid without a change in temperature
specific latent heat of vaporisation
the specific latent heat of vaporisation of a substance is the amount of heat energy required to change 1Kg of the substance from a liquid to a gas without a change in temperature
conduction
conduction is the transfer of heat energy from a hot place to a cold place through solids by molecular vibrations
convection
convection is the transfer of heat through liquids/gasses by molecular movement called convectional currents
radiation
radiation is the transfer of heat from one place to another in the form of electromagnetic waves, there is no need for a medium
solar irradiance
solar irradiance (solar constant) is the average amount of the Sun’s energy falling per second perpendicularly on 1 metre squared of the Earth’s atmosphere
u-value
u-value is the amount of heat energy conducted per second through 1 metre squared of a substance, when a temperature difference of 1K (1C) is maintained
