explain why specfic heat heat at constant pressure is greater then the specific heat of constant volume
Answers
values Cp are more than Cv at all the temperatures and pressure. ... Specific heat: The amount of heat required to raise the temperature of body by 1°C. Cp= Specific heat at constant pressure; Cv= specific heat at constant volume. Internal energy(U) is the measure of temperature of body.
Specific heat is amount of heat needed to raise the temperature by 1 °C of specific mass. Raise the temperature by 1 °C is indirectly raising internal energy of that matter ie gas (Only gases have Cp and Cv) by certain amount. Now we are heating a gas at constant pressure, to maintain the pressure constant we need to allow the gas to expand. So the provided heat is utilised to raise the temperature (internal energy) and expansion as well. Unlikely in constant volume heating process all the heat supplied is utilised to raise the temperature of the gas. Indicates, at constant pressure, more heat is needed to raise the cetain fix °C of temperature of a particular gas than at constant volume. This clearly explain that values Cp are more than Cv at all the temperatures and pressure.
Note: Cp and Cv values for solid/liquid are same and called specific heat only.
The calorific capacity at constant pressure, Cp, is always greater than at constant volume, CV, since when heat is transferred to the substance at constant pressure, the substance is allowed to expand performing thermal expansion work. Therefore, the same substance will need more heat to increase the temperature one degree at constant pressure than at constant volume.
Hope this may help you..and be the brainliest..