Pressures In Liquids And And Gases Flashcards
What is a fluid
A substance that can flow (liquid or gas)
What is the units of pressure that is equal to one newton per square meter
Pascal
Why doesn’t the pressure in a liquid increase
Pressure at any point in a liquid is due to the weight of the liquid depends on its density
Why does the pressure in a liquid depend on the density of the liquid
Pressure is due to the weight of the liquid and the weight of a liquid depend on its density
What is upthrust
The resultant force due to the difference in pressure between the top and bottom surfaces of an object submerged in a fluid
What will and object placed on a fluid do if it’s weight is equal to the upthrust
Float
What will an object placed in the fluid do if it’s weight is greater than the upthrust
Sink
Why does an object that that is more dense than a fluid sink if it’s placed in the fluid
Weight of the object is greater than the weight of the fluid displaced so the weight of the object is less than the upthrust
Why does an object that is less dense than a fluid float if its is placed in the fluid
Weight of the object is less than the weight of the fluid displaced, the weight of the objects is less than the upthrust
Does an object that is partially submerged in a fluid experience a greater pressure on its bottom or top surface
Bottom
What is the earths atmosphere
The layer of air that surrounds the earth
What is atmospheric pressure caused by
Air molecules colliding with surfaces
What does atmospheric pressure decrease with increased altitude
The density of the air decreases, fewer air molecules as you go as you go higher- there is less weight of air above a surface and fewer air molecules so density of the atmosphere decreases
How does the height of the atmosphere compares to the radius of the earth
It is smaller
