Heat is said to rise. Then why are mountain tops colder?

When heat is said to rise, we are referring to only one of the ways that heat can be transmitted---convection. Focusing exclusively on convection is what creates the conundrum. But what is convection? The warmer molecules of a fluid like air will move apart and become less dense. As a result their weight will be... Continue Reading →

Brownian Motion

In the 15 years that I spent at my last school, the caretakers rarely, if ever, dusted the top border of the chalkboard. I used their laziness to my advantage, revealing to students that it was evidence that the chalk particles from my constant erasing were small enough to be deflected upwards by the random... Continue Reading →

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