Bill Nye: The Science Guy

Season 2 Episode 2

Wind

0
Aired Unknown Feb 25, 1994 on Disney Channel
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Wind
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Some answers, my friend, do in fact, blow in the wind.
A cool breeze is great on a hot summer day. A cold winter wind can chill you until you can't stop shivering.
Where does all that wind come from? It starts with the Sun. Energy from the Sun warms the Earth and
the atmosphere, the air, above it. As the world turns into darkness each night, the atmosphere cools off.
The molecules in a mass of warm air are more spread out than the molecules of air in a cold air mass.
So cold air is heavier than warm air. Cool air masses squeeze warm air up. That's why you may hear
people say, "Warm air rises." The Sun warms the Earth with huge amounts of heat each day. And, the
Earth is spinning. So, as air masses move up and down, they get nudged sideways along the Earth's
surface at the same time. Try drawing a straight line on a spinning ball. It'll curve. The same thing happens
to make wind.
Air travels all over the Earth moving across deserts, up and down mountains, through valleys, and over
the oceans. These features churn the atmosphere and make wind as well, picking up and releasing water.
That's why it rains, snows, sleets, and hails.
To survive, we humans have to handle tornadoes, hurricanes, and typhoons every year. There is a huge
amount of energy in the wind. That's why humans harness the wind's energy with sails, wind turbines
(windmills), and kites.
What Bill Nye will show about the wind will blow you away.

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