Look up: Enthalpy

1. 
   Enthalpy
   The heat content of a specific amount of substance; defined as E= PV.
   Found on http://home.nas.net/~dbc/cic_hamilton/di
   
   
2. 
   Enthalpy
   A measure of internal energy of a system. For a gas: H=E+pV Where H is the enthalpy, E is the internal energy, p is the pressure and V is the volume.
   Found on http://www.geologyrocks.co.uk/glossary/l
   
   
3. 
   enthalpy
   enthalpy or Helmholtz free energy (identifier H): for thermodynamic systems, it makes a difference if a process that changes U is carried out at constant volume or at constant pressure. For a process at constant volume and entropy, use internal energy U. For a process at constant pressure and entropy, enthalpy is a better choice
   Found on http://www.maxwellian.demon.co.uk/faq/gl
   
   
4. 
   Enthalpy
   Change in heat. See also: Heat, Hess's Law, Stagnation Enthalpy.
   Found on http://www.diracdelta.co.uk/science/sour
   
   
5. 
   Enthalpy
   The heat content of a specific amount of substance, defined as E= PV.
   Found on http://www.allchemicals.info/index/actio
   
   
6. 
   enthalpy
   (H) enthalpy change. Compare with heat. Enthalpy (H) is defined so that changes in enthalpy (H) are equal to the heat absorbed or released by a process running at constant pressure. While changes in enthalpy can be measured using calorimetry, absolute values of enthalpy usually cannot be determined. Enthalpy is formally defined as H = U + PV, where...
   Found on http://antoine.frostburg.edu/chem/senese
   
   
7. 
   enthalpy
   Enthalpy (H) is a thermodynamic property of a system defined by H = U + pV where U is the internal energy of the system, p its pressure, and V its volume. J.W. Gibbs put the concept of an ensemble forward in 1902. In a chemical reaction carried out in the atmosphere the pressure remains constant and the enthalpy of reaction (?H), is to equal ?H = ?...
   Found on http://www.ktf-split.hr/periodni/en/abc/
   
   
8. 
   Enthalpy
   is the heat of reaction, either exo- or endothermic. It is measured either in kilocalories/mole or kilojoules/mole.
   Found on http://www.chemicalglossary.net/definiti
   
   
9. 
   Enthalpy
   Change in heat.
   Found on http://www.chemicalglossary.net/definiti
   
   
10. 
    enthalpy
    Change in heat.
    Found on http://www.shodor.org/UNChem/glossary.ht
    
    
11. 
    Enthalpy
    The amount of energy released or absorbed by a chemical reaction. The 'Free Enthalpy' (also called the ' Change in Gibbs Free Energy') in a reaction is the maximum amount of chemical energy available from a system that can be converted into electrical or mechanical energy and vice versa. (discharge and charge respectively)
    Found on http://www.mpoweruk.com/glossary.htm
    
    
12. 
    Enthalpy
    The sum of the internal energy of a body and the product of its volume multiplied by the pressure.
    Found on http://www.flowmeterdirectory.com/flowme
    
    
13. 
    enthalpy
    heat content of moist air Category: Standards, measures and testing • function of state equal to the sum of the internal energy of a body and the product of pressure and its volume.H=U+pV Category: Chemistry
    Found on http://www.mijnwoordenboek.nl/definition
    
    
14. 
    Enthalpy
    The quantity of heat necessary to raise the temperature of a substance from one point to a higher temperature. The quantity of heat includes both latent and sensible.
    Found on http://www.neo.ne.gov/statshtml/glossary
    
    
15. 
    enthalpy
    The heat in a system. ... (09 Oct 1997) ...
    Found on http://www.mondofacto.com/facts/dictiona
    
    
16. 
    Enthalpy
    In thermodynamics and molecular chemistry, the `enthalpy` or `heat content` is a quotient or description of thermodynamic potential of a system, which can be used to calculate the `useful` work obtainable from a closed thermodynamic system under constant pressure. The term `enthalpy` is composed of the prefix `en-`, meaning to `put into`, plus the Greek word `-thalpein`, meaning `to heat`, although the original definition is thought to have ste...
    Found on http://en.wikipedia.org/wiki/Enthalpy
    
    
17. 
    enthalpy
    the sum of the internal energy and the product of the pressure and volume of a thermodynamic system. Enthalpy is an energy-like property or state ... [6 related articles]
    Found on http://www.britannica.com/eb/a-z/e/34
    
    
18. 
    enthalpy
    Heat content, symbolized as H; a thermodynamic function, defined as E + PV, where E is the internal energy of a system, P the pressure, and V the volume; the heat of a reaction, measured at constant pressure, is H. Syn: heat 4 [G. enthalp, to warm in]
    Found on
    
    
19. 
    Enthalpy
    The sum H of the internal energy U and the work energy PV of a fluid at a given temperature and pressure.. H = U + PV. (J/g)
    Found on http://www-bdnew.fnal.gov/operations/acc
    
    
20. 
    Enthalpy
    The sum H of the internal energy U and the work energy PV of a fluid at a given temperature and pressure.. H = U + PV. (J/g)
    Found on http://www-bdnew.fnal.gov/operations/acc
    
    
21. 
    enthalpy
    function of the state of a physical system equal to the sum of the internal energy of the system and the product of pressure and volume of the system
    Found on http://www.electropedia.org/iev/iev.nsf/
    
    
22. 
    enthalpy
    A thermodynamic property of a substance given by, H = U + pV, where U is the internal energy, p is the pressure, and V is the volume. For any process that occurs at constant pressure the heat absorbed or evolved is equalt to the enthalpy change if the only work is pressure/volume work, i.e. &Delta...
    Found on http://www.daviddarling.info/encyclopedi
    
    
23. 
    enthalpy
    A thermodynamic property of a substance, defined as the sum of its internal energy plus the pressure of the substance times its volume, divided by the mechanical equivalent of heat. The total heat content of air; the sum of the enthalpies of dry air and water vapor, per unit weight of dry air; measu...
    Found on http://www.daviddarling.info/encyclopedi
    
    
24. 
    enthalpy
    enthalpy (en'thălpē) , measure of the heat content of a chemical or physical system; it is a quantity derived from the heat and work relations studied in thermodynamics. As a system changes from one state to another the enthalpy change, ΔH, is equal to the enthalpy of the produ...
    Found on http://www.infoplease.com/ce6/sci/A08174