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 →

Icicle Adventures

Despite below freezing temperatures, ice can melt in sunlight. This indicates that ice molecules can easily get agitated to above freezing temperatures even if surrounding air molecules have less energy of motion. If the melt-water runs down an edge, heat can be taken away again from the dripping water. An icicle begins to form. If... Continue Reading →

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