Have you ever looked at a hot air balloon off in the distance and wondered how it works? What keeps those big, beautiful balloons up in the air? How do you steer them? How do you land it? How do you ride in one? Well, it all comes down to one simple law of physics: warmer air rises in cooler air. Why is this? Because hot air is lighter than cool air and as a result, it has less mass per unit of volume. For example, a cubic foot of air weighs roughly 28 grams....
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