pressure in fluids

Question 1

what is a fluid

Answer 1

a liquid or a gas

Question 2

how to calculate pressure

Answer 2

force / area

Question 3

units of force

Answer 3

Newtons

Question 4

units of area

Answer 4

m squared

Question 5

what happens to pressure of atmosphere w increasing altitude

Answer 5

density of the atmosphere decreases
less air molecules with increased height
less collisions
less pressure