I can’t seem to wrap my head around the term pressure.
Vehicle tyres use air pressure, toilets faucets etc use pressure (presumably water pressure),
pressing onto something applies pressure, our blood has pressure, temperature is also affected by “pressure”.
I know there are various types of pressure, and I can’t think of any more examples at the moment, but my point is “pressure” sounds like a very arbitrary or vague umbrella term to me.
Help me make sense of it?
In: 3
Most have already captured what pressure is mathematically. Your other question in how it’s related to temperature is fairly straightforward too if you think about it through the ideal gas law. PV=nRT
P, pressure
V, volume
n, number of moles of the compound
R, constant fixed number
T, temperature
For the purposes of this think of both n and R as constant.
As you increase temperature, if you are in a fixed space (the volume is constant), then the pressure shares a linear correlation with the temperature. And inversely, if the space has room to expand/contract the pressure will remain constant as temperature fluctuates
This is why tires need to be filled up more frequently in the winter. The outside air lowers the PSI because of the fixed volume. And it’s also why you can visibly see a flat tire, once the pressure is low enough, it actually occupies less volume.
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