Heat change can happen over time {heat flow}. Heat flow is from high-temperature region to low-temperature region. Heat flow converted to translational kinetic energy exerted in direction can do work. Engines use adiabatic and isothermal heat-flow stages to perform work.
Heat flow can have constant heat {adiabatic}|. Temperature goes up in one location and down in another location.
Heat flow can have constant pressure {isobaric}|, typically in systems open to atmosphere.
Heat flow can have constant temperature {isothermal}|. Heat flows into or out of heat sinks or sources.
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Date Modified: 2022.0225