Heat: Conduction, Convection, Radiation

Molecular Gastronomy Adventure

What is heat?

Heat is a form of energy. Heat describes the average speed of molecules in a substance. If a molecule is moving quickly, it has a higher temperature. If a molecule is moving slowly, it has a lower temperature. It is important to note that temperature is the AVERAGE speed of molecules in a substance. Thus, within the substance, not all molecules are moving at the same speed. Some may be moving slowly and others may be moving quickly but temperature is determined by the average speed of all molecules.

As you can see in the graph above, molecules fall under a range of many different molecular speeds. The blue graph shows a cooler temperature than the red curve because the blue curve’s molecules have a lower average molecular speed than the red curve’s molecules.

So, what does heat have to do with cooking?

It seems like an…

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