# Differentiation Question Involving Pressure

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#1
Can someone explain in part c why the altitude is increasing.

I get all the same answers that they do and I understand that if pressure is decreasing then altitude would be increasing since the higher up you go the fewer gas molecules there are.

But the rate of change is a negative 12.13 so how from this do you know that altitude is increasing surely it should be +12.13
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1 month ago
#2
(Original post by Hollymae764)
Can someone explain in part c why the altitude is increasing.

I get all the same answers that they do and I understand that if pressure is decreasing then altitude would be increasing since the higher up you go the fewer gas molecules there are.

But the rate of change is a negative 12.13 so how from this do you know that altitude is increasing surely it should be +12.13
Pressure decreasing means dP < 0 so

da = (-12.13) dP = (-ve)(-ve) = +ve > 0

hence a increasing
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