pressure Flashcards
1
Q
what is pressure? and what is its formula?
A
the force acting per unit area. P=F/A .F is in N, A is in m2, P is in pascals
2
Q
formula of pressure in liquid?
A
p=rho(h)(g). rho is density in kgm-3, h is height in m, gravitational field strength(Nkg-1)
3
Q
what is the same in a hydraulic press?
A
work done and pressure.
4
Q
what is atmospheric pressure?
A
the pressure the atmosphere exerts on the earth’s surface and us
5
Q
how is altitude and atmospheric pressure related?
A
the higher the altitude, the lower the atmospheric pressure
