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 ].