Heat Flashcards
(16 cards)
Temperature
the measure of the hotness or coldness of a body
Thermometric property
Any physical property that changes measurably with temperature.
Examples of thermometric properties
Length of a column of liquid
electrical resistance
Emf of a thermocouple
Colour
Heat capacity
The heat energy needed to change its temperature by 1K
Specific heat capacity
The heat energy needed to change the temperature of one kilogram of that substance by 1K
Latent heat (L)
the heat energy needed to change its state without a change in temperature
Specific latent heat
the amount of heat energy needed to change the state of 1 kg of a substance without a change in temperature
Specific latent heat of fusion
the amount of heat energy needed to change 1 kg of that substance from a solid to a liquid without a change in temperature (melting point)
Specific latent heat of vaporisation
the amount of heat energy needed to change 1 kg of that substance from a liquid to gas without a change in its temperature ( boiling point)
Formula for latent heat
Q=ml
Q- heat energy
m- mass
l- specific latent heat of fusion/ vaporisation
Conduction
The movement of heat energy through solids by the vibration of heated molecules. there is no overall motion of the substance
U-Value
the u-value of a structure is the amount of heat energy conducted per second through 1m squared of that structure when a temperature difference of 1C is maintained between its ends.
Radiation
Th transfer of heat energy from one place to another in the form of electromagnetic waves
convection
The transfer of heat through a fluid by means of circulating currents of fluid caused by the heat
A thermocouple thermometer and an alcohol-in-glass thermometer each gave a different
reading when placed in the same container of water. Explain why this occurred.
different thermometric properties
change differently with temperature changes
What is the SI unit of temperature? Give an advantage of using this unit in scientific
measurements.
Kelvin
Its always positive
