how is thermal energy transferred
from region of higher temperation to region of lower temperature
define thermal energy
the energy possessed by an object due to its temperature
what happens at thermal equilibrium
the regions have equal temperature
No net transfer of thermal energy
what are the physical properties that can be used to measure temperature
- liquid density
- volume of a gas at constant pressure
- resistance of a metal
- e.m.f of thermocouple
define specific heat capacity
the thermal energy required to raise the temperature per unit mass of a substance by 1 degree
formula of thermal energy
∆Q = mc∆T
does scale of thermodynamic temperature depend on the property of any particular substance
no
what is absolute zero
0 K or -273 C, lowest possible energy
describe the curve of heating (no need)
- rise initially
- reaches melting point, no rise of temp despite thermal energy absorbed
- rise continuously
- reaches boiling point, no rise of temp despite thermal energy
- rise endless
need to know the graph
define specific latent heat
the thermal energy required to change the state of 1unit mass of a substance without changing any temperature
what are the 2 types of specific latent heat
- latent heat of fusion (melting)
- latent heat of vaporisation (boiling)
what is the difference between latent heat and specific latent heat
specific refers per mass
equation for latent heat
Q = Lm
L: specific latent heat
m: mass
why does latent heat of vaporisation always higher than fusion
to change from solid to liquid, there is only more space of separation.
to change from liquid to gas, the intermolecular bonds are destroyed
