[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.27,0:00:02.26,Default,,0000,0000,0000,,So, what are the consequences of something
Dialogue: 0,0:00:02.26,0:00:05.11,Default,,0000,0000,0000,,being placed under pressure? Well, if I look
Dialogue: 0,0:00:05.11,0:00:08.10,Default,,0000,0000,0000,,at this balloon, I can apply pressure to it by
Dialogue: 0,0:00:08.10,0:00:12.69,Default,,0000,0000,0000,,exerting a force over its area. And when I do,
Dialogue: 0,0:00:12.69,0:00:14.56,Default,,0000,0000,0000,,well, the balloon actually gets a little bit
Dialogue: 0,0:00:14.56,0:00:17.93,Default,,0000,0000,0000,,smaller. The air inside the balloon gets a
Dialogue: 0,0:00:17.93,0:00:20.35,Default,,0000,0000,0000,,little more densely packed together. And
Dialogue: 0,0:00:20.35,0:00:24.60,Default,,0000,0000,0000,,in fact, this is exactly what happens on earth.
Dialogue: 0,0:00:24.60,0:00:26.48,Default,,0000,0000,0000,,Out here, far away from the surface of the
Dialogue: 0,0:00:26.48,0:00:29.76,Default,,0000,0000,0000,,earth, there are not very many air molecules.
Dialogue: 0,0:00:29.76,0:00:31.61,Default,,0000,0000,0000,,This is a low pressure environment and
Dialogue: 0,0:00:31.61,0:00:33.30,Default,,0000,0000,0000,,with nothing to weigh down on these air
Dialogue: 0,0:00:33.30,0:00:35.85,Default,,0000,0000,0000,,molecules from above, they’re basically
Dialogue: 0,0:00:35.85,0:00:38.83,Default,,0000,0000,0000,,free to play. They are free to move around.
Dialogue: 0,0:00:38.83,0:00:40.81,Default,,0000,0000,0000,,Now below this outer layer of the
Dialogue: 0,0:00:40.81,0:00:44.19,Default,,0000,0000,0000,,atmosphere, where all these air molecules
Dialogue: 0,0:00:44.19,0:00:47.04,Default,,0000,0000,0000,,are sort of weighing on the atoms below it,
Dialogue: 0,0:00:47.04,0:00:49.02,Default,,0000,0000,0000,,the molecules below it, and so these become
Dialogue: 0,0:00:49.02,0:00:51.72,Default,,0000,0000,0000,,a little more densely packed. And as we go
Dialogue: 0,0:00:51.72,0:00:53.39,Default,,0000,0000,0000,,even further down towards the surface of
Dialogue: 0,0:00:53.39,0:00:57.22,Default,,0000,0000,0000,,the earth, where us humans tend to live,
Dialogue: 0,0:00:57.22,0:00:59.50,Default,,0000,0000,0000,,the air gets even more densely packed.
Dialogue: 0,0:00:59.50,0:01:01.25,Default,,0000,0000,0000,,And so we see that down near the surface
Dialogue: 0,0:01:01.25,0:01:03.89,Default,,0000,0000,0000,,of the earth, where we have high pressure,
Dialogue: 0,0:01:03.89,0:01:06.28,Default,,0000,0000,0000,,we also have a high density of air molecules.
Dialogue: 0,0:01:06.28,0:01:08.30,Default,,0000,0000,0000,,And this high density of air molecules makes
Dialogue: 0,0:01:08.30,0:01:11.75,Default,,0000,0000,0000,,us humans living at the surface very happy.
Dialogue: 0,0:01:11.75,0:01:13.50,Default,,0000,0000,0000,,So I want to know, why do humans like high
Dialogue: 0,0:01:13.50,0:01:15.36,Default,,0000,0000,0000,,pressure so much? Maybe the weight from
Dialogue: 0,0:01:15.36,0:01:17.66,Default,,0000,0000,0000,,all that air above us keeps us from growing
Dialogue: 0,0:01:17.66,0:01:20.02,Default,,0000,0000,0000,,too tall. Maybe air pollution tends to go to
Dialogue: 0,0:01:20.02,0:01:22.50,Default,,0000,0000,0000,,regions of low pressure. Or maybe it means
Dialogue: 0,0:01:22.50,0:01:24.77,Default,,0000,0000,0000,,that there’s lots of oxygen for us to breathe.
Dialogue: 0,0:01:24.77,0:01:27.00,Default,,0000,0000,0000,,Go ahead and choose the best answer.