Sitting at a campfire, there is nothing worse than when the smoke seems to follow you. There you are trying to enjoy a fire, minding your own business, when the smoke seems to pick you to pick on.

There are scientific reasons for this, and why the smoke likes to favor some over others.

Let's start with the basics.

We have told you in the past that the atmosphere is a fluid. It yields easily to external pressures, has no fixed shape, but takes the shape of its container. This also means that if you move air molecules, other air molecules have to move in to fill the void.

When you put your hand in water and move it around, other water fills the void! Ray Petelin

Sort of like moving your hand through water.

When you push some water in a container, the other water in the container fill

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