WORK
*Work is one of the basic modes of energy transfer. The work is done by a force as it acts upon a body moving in the direction of the force.
*Work is said to be done by a system if the sole effect on things external to the system can be reduced to the raising of a weight.
POWER
This is defined as the rate of doing work (or) work done per unit time.
ENERGY
*Energy is the capacity of physical system to perform work.
*Energy exists in several forms such as heat, kinetic (or) mechanical energy light,potential energy, electrical, solar wind, hydroelectric (or) other forms.
POTENTIAL ENERGY
The energy which is a system possess by virtue of its position in a gravity field is called potential engy.
KINETIC ENERGY
The energy which a system possess by virtue of its motion is called kinetic energy.
HEAT
The heat is defined as the energy transferred without transfer of mass, across the boundary of system because of a temperature difference between the system and the surrounding.
HEAT CAPACITY
Heat capacity of a substance may be defined as the heat required to raise the temperature of whole mass of a substance through one degree.
INTERNAL ENERGY
*Joule's law of internal energy states that internal energy of a perfect gas is a function of temperature only.
*Internal energy of a gas dependent on the temperature change only and is not affected by the change only not is affected by the change in pressure and volume.
ENTHALPY
One of the fundamental quantities which occur invariably in thermodynamics is the sum of internal energy (U) and pressure volume product (pv) .This sum is called Enthalpy (h).
h = u+pv
THERMODYNAMIC PROCESSES
1.Flow process
The process occurring in open systems which permit the transfer of mass and from the system are known as flow process.
2.Non Flow process
The process occurring in closed systems which do not permit the transfer of mass across their boundaries are known as non - flow process.
ADIABATIC PROCESS
As already stated, an adiabatic process is one in which no heat is supplies (or) rejected.
Q=0