It's a thermodynamic constant or a qiantity which is the sum of tital heat of the system.
it is given as sum of total internal enrgy with product of pressure and volume.
						

							
@ shrada 
1- enthalpy is a measure of total energy of a thermodynamic system , it includes the internal energy , which is energy required to create a system , 
2- unit of enthalpy is joule (si unit ) 
3-the total enthalpy of a system cannotbe measured directly . 
so, change in enthalpy can be measured . 
HOPE IT CLEARS YOUR DOUBT 
ALL THE BEST 
						

							
enthalpy is the some of internal energy and pressure volume work  
or it is the heat q at const p.
						

							
Heat change is also called enthalpy
It is also represented by delta triangle
 
						

							It is a thermodynamic property of a system. It is the sum of internal energy added to the product of the pressure and volume of the system.it reflects the capacity to release heat .enthalpy is denoted by H and specific enthalpy is h
						

							It is a thermodynamic property of a system. It is the sum of internal energy added to the product of the pressure and volume of the system.it reflects the capacity to release heat .enthalpy is denoted by H and specific enthalpy is denoted by h