Two samples A and B of the same mass of a gas, initially at the same pressure, temperature and volume are compressed to half the original volume. A isothermally and adiabatically. The final pressure of A is

In thermodynamics, heat is the thermal energy transferred between systems due to a temperature difference. In colloquial use, heat sometimes refers to thermal energy itself. Thermal energy is the kinetic energy of vibrating and colliding atoms in a substance.