Pressure
Channel: Thermodynamics For Everyone
Date: 17/09/2021

This video goes through the concept of "pressure".

We all have an innate sense. Pressure is how strongly something pushes something else. When you stand on a scale in the bathroom, the gravitational force of Earth causes your body to apply a pressure to the scale, which is measured as your weight. When a piston fires in an internal combustion engine, pressure is applied by the expanding gas to push the piston and lead to motion. When you descend in an airplane and your ears get stuffy, the cause is the pressure differential from higher to lower altitudes. Interestingly, the Earth's atmosphere at sea level provides the equivalent pressure of trying to hold 10 m of water on your shoulders. This sense of pressure is part of our everyday experience. It is something that we feel in our human perception, and it is quite often literally something that pushes and pulls us with forces.

From this qualitative, feely concept, how should we "quantify" pressure?  Nature is simple: pressure is pressure. But humans: we introduce many different systems for quantifying pressure, such as Pascals, atmosphere, bars, or torr. Let's get familiar with some of these concepts by looking at pressures in everyday devices, such as different types of tires, showerheads, the human heart, and other devices.

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Re-use permissions were granted by Copyright Holder for use in this video only, as follows:
* video, submarine, https://www.youtube.com/watch?v=QLf_yD-lpF0, accessed 16 May 2021.
* video, weather balloon video, https://www.youtube.com/watch?v=AReBHEbWA7M, accessed 
16 May 2021.
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