Summary of Pressure Flashcards
What is Boyle’s Law?
The volume of a given amount of gas held at constant temperature is inversely proportional to the pressure under which it is measured.
Pressure to Temperature
Directly proportional
Pressure to volume
Inversely proportional
Pressure to Surface Arra
Inversely proportional
Pressure to force
Directly proportional
Pressure to Height
Inversely proportional
There is more pressure at greater _______ in liquids and in denser materials.
Depths
In a container with multiple opening with the same depth, where is pressure the greater?
The pressure is the same throughout
The pressure at a given depth is ______ of direction because it is the same in all ______.
Independent
Directions
When we measure the pressure of _____, like that of the air in car tyres, we usually make this measurement relative to normal ____ pressure. That is we calculate the difference between the pressure in the tyre and the pressure exerted by _____. Liquids can also be measured against normal air pressure.
Gases
Air
Atmosphere
Why do objects want to float when put into deep water?
There is more pressure at the bottom of an object because pressure increases with depth. This difference in pressure results in an upward buoyant force on the object.
What is buoyancy?
An upward force exerted by a fluid that opposes the weight of an immersed object
When will an object in a fluid sink?
If the object’s weight is greater than the buoyant force
When will an object in a fluid float?
An object floats if the buoyant force on the object is equal to the object’s weight.
When the diver is at the bottom, what happens to the buoyancy and the air bubble?
Small buoyancy and the air will compress when squeezed hard.
When the diver is at the top of the bottle, what happens to the air bubble and the buoyancy?
Air bubble will expand when not squeezed and large buoyancy.
Why does a submarine float?
Because the pressure within its tanks are equal with the water pressure. Buoyant force is equal to weight.
Why does the submarine sink?
Air escapes from its tanks as water fills the tanks. Adds weight to the submarine. Weight is less than buoyant force.
Why does a submarine float?
Compressed air is released into the tanks and water is forced out. Buoyant force is greater than weight.
What is Pascal’s principle?
A pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere.
Hydraulics make it easier to lift _____ objects
Heavy
By applying a small force on piston 1 is it possible to exert a large force at piston 2?
Liquids almost incompressible and so they distribute pressure applied to them in all directions.
How are dam walls built?
Dam walls are built so that it can support the increasing hydrostatic pressure with depth. So it is fatter and the bottom.
