The value of y depends on atomicity of the gas . Amount of heat energy required to change the temperature of any substance is given by
Q = mcΔt where , m = mass of the substance , c = specific heat of the substance and Δt = change in temperature . Thermal ( Heat ) Capacity
Heat capacity of any body is equal to the amount of heat energy required to increase its temperature through 1 ° C .
Heat capacity = me
where c = specific heat of the substance of the body and m = mass of the body .
Its SI unit is joule / kelvin ( J / K ). Water Equivalent
It is the quantity of water whose thermal capacity is same as the heat capacity of the body . It is denoted by W .
W = ms = heat capacity of the body . Latent Heat
The heat energy absorbed or released at constant temperature per unit mass for change of state is called latent heat .
Heat energy absorbed or released during change of state is given by Q = mL
where m = mass of the substance and L = latent heat . Its unit is cal / g or J / kg and its dimension is [ L 2 T -2 ].