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单词 enthalpy
释义
enthalpy
Physics

  • Symbol H. A thermodynamic property of a system defined by H=U+pV, where H is the enthalpy, U is the internal energy of the system, p its pressure, and V its volume. In a chemical reaction carried out in the atmosphere the pressure remains constant and the enthalpy of reaction, Δ‎H, is equal to Δ‎U+pΔ‎V. For an exothermic reaction Δ‎H is taken to be negative.

Chemistry

  • A thermodynamic property of a system defined by H = U + pV, where H is the enthalpy, U is the internal energy of the system, p its pressure, and V its volume. In a chemical reaction carried out in the atmosphere the pressure remains constant and the enthalpy of reaction, Δ‎H, is equal to Δ‎U + pΔ‎V. For an exothermic reaction Δ‎H is taken to be negative.

Chemical Engineering

  • The thermal energy of a substance or system with respect to an arbitrary reference point. The enthalpy of a substance is the sum of the internal energy and the flow of energy, which is the product of the pressure and specific volume:

    H=U+pV

    The reference point for gases is 273 K and for chemical reactions is 298 K. For foods and refrigerants the reference temperature is 243 K (-40°C).

Biology

  • Symbol H. A thermodynamic property of a system defined by H=U+pV, where H is the enthalpy, U is the internal energy of the system, p its pressure, and V its volume. In a chemical reaction carried out in the atmosphere the pressure remains constant and the enthalpy of reaction, Δ‎H, is equal to Δ‎U + pΔ‎V. For an exothermic reaction Δ‎H is taken to be negative.
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