Why Are Some Still Using Methylene Chloride to Extract Caffeine?

Methylene chloride, also known as dichloromethane, is a solvent that, compared to water, can do a better job at dissolving certain substances such as grease, paint and caffeine. The so-called non polar solvent is mass-produced. It's used by the fracking and plastic industry and in the production of HFC-32, a widely used replacement for CFCs... Continue Reading →

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 16 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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