Differentiate between work, heat, temperature, and enthalpy.

Expert Answers
ncchemist eNotes educator| Certified Educator

Work is defined as a force acting on an object such that it moves the object some measureable amount.  In classical mechanics it is quantified by the equation w=f*d (work equals force times distance).

Heat is defined as a thermal energy transfer.  Heat travels spontaneously from areas of high concentration to low concentration.

Temperature is a physical property.  It is the measure of heat in an object.  When measured on the Kelvin scale, it measures the amount of heat above absolute zero (the point where all molecular motion stops).

Enthalpy is is the measure of energy of a system.  It is often used to measure the energy change in a chemical reaction.

Work, heat, and enthalpy are are all energy based and as such are measured in Joules (kg*m^2/s^2).  Temperature, as a physical property, is measured using various degree scales (F, C, or K).