If you open the door and let them outside they burst out and start running

If you open the door and let them outside they burst

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become quite energetic and start running around the room. If you open the door and let them outside, they burst out and start running around the larger space, spreading out in the yard. The same thing happens when a fluid is heated. The molecules at the bottom gain energy and begin to move faster. As they move faster, they begin to spread apart, which makes the fluid less dense. But instead of being confined to a yard, the fluid's warmer molecules begin to move upward, while the cooler, denser fluid begins to sink (just like the children start settling down as their cookie rush subsides). Once the cooler molecules reach the bottom where the heat is, it's like they ate another cookie and get an increase in energy again. They rise back up to the top, while the cooler molecules sink back to the bottom. The cycle continues if there is a heat source at the bottom. What does this have to do with air vents in a house? Well, if you live in a cold climate, you probably use your heat more often than your A/C. And if you live in a warmer climate, you probably use your A/C more than your heat. So, if hot air rises, and you use your heat more often, you'll want your vents on the floor so that hot air travels upward to fill the room as it comes out of the vents. The opposite is true for air conditioning: if cool air sinks, you wouldn't
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