Enthalpy is a thermodynamic property that describes the total heat content of a system. It is related to pressure change through the equation: dH = Vdp, where dH is the change in enthalpy, V is the volume, and dp is the change in pressure.
Enthalpy is used in problem solving to analyze and predict the changes in heat and energy of a system. This is particularly useful in chemical reactions and phase changes.
The most common units used to measure enthalpy are joules (J) and kilojoules (kJ). In some cases, calories (cal) or kilocalories (kcal) may also be used.
As pressure increases, the volume of a system decreases, resulting in a decrease in enthalpy. Similarly, a decrease in pressure leads to an increase in enthalpy. This is based on the equation: dH = Vdp, where pressure is directly proportional to the change in enthalpy.
Yes, enthalpy can be measured experimentally using various methods such as calorimetry, which measures the heat exchange between a reaction and its surroundings, or through bomb calorimetry, which measures the heat of combustion of a substance.