What is Enthalpy?Answer in Briefly .
Answers
Answer:
Enthalpy is a thermodynamic property of a system. It is the sum of the internal energy added to the product of the pressure and volume of the system. It reflects the capacity to do non-mechanical work and the capacity to release heat.
Enthalpy is denoted as H; specific enthalpy denoted as h. Common units used to express enthalpy are the joule, calorie, or BTU (British Thermal Unit.) Enthalpy in a throttling process is constant.
Change in enthalpy is calculated rather than enthalpy, in part because total enthalpy of a system cannot be measured since it is impossible to know the zero point. However, it is possible to measure the difference in enthalpy between one state and another. Enthalpy change may be calculated under conditions of constant pressure.
One example is of a firefighter who is on a ladder, but the smoke has obscured his view of the ground. He cannot see how many rungs are below him to the ground but can see there are three rungs to the window where a person needs to be rescued. In the same way, total enthalpy cannot be measured, but the change in enthalpy (three ladder rungs) can.
Enthalpy Formulas
H = E + PV
where H is enthalpy, E is internal energy of the system, P is pressure, and V is volume
d H = T d S + P d V
Answer:
Enthalpy is the measurement of energy in a thermodynamic system . The quantity of enthalpy equals to the total content of heat of a system , equivalent to the system's internal energy plus the product of volume and pressure .