How to Measure Pressure With a Phone and a Baggie

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This says stress is simply pressure (F) per unit of space (A). If the pressure is measured in newtons and the realm is in sq. meters, then the stress can be in models of N/m2, which is known as a pascal. However you should utilize different models too, like kilos per sq. inch or atmospheres (1 atm is about 105 pascals).
As you possibly can see, if the mass on prime of the bag stays the identical, in order that the gravitational pressure F is unchanged, however the space decreases, then the stress must improve. Is that legit? That is what's so nice about this experiment—you possibly can test the outcomes your self.
May You Use It As a Scale?
Now how about one thing extra difficult? Given the connection between the mass on prime and the air stress inside, might you employ this barometer-in-a-bag setup to measure the mass of one thing? I feel it can work. (Technically it could measure the weight of the object, not the mass.) This is what I will do:
  • Begin with simply the Lego platform on prime and file the stress.
  • Place a brand new object, of unknown weight, on prime.
  • File the brand new stress. It is this alteration in stress we wish.
  • Subsequent, make the Lego platform smaller and repeat.
Perhaps it can assist if I rewrite the stress equation like this:
Illustration: Rhett Allain
If I plot stress on the vertical axis and 1/A on the horizontal axis, then this could look identical to the equation for a line with the pressure because the slope. OK—let's do it. Oh wait! What concerning the space of the Lego platform? On this case, I used a number of bricks of the identical measurement (0.96 x 3.18 cm) in order that I might simply take away a brick and cut back the floor space by a identified quantity. Sure, Lego pieces are very uniform in size.
Hmm ... that was my plan, nevertheless it did not work. The stress within the bag ought to improve after I swap within the smaller Lego platform, nevertheless it did not. I truly suppose my bag may be leaking. Irrespective of, this experiment is so that you can do at residence. See if you can also make it work.

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