# P1 Atmospheric Pressure & Liquid Pressure

• Created by: Aleena
• Created on: 05-04-18 18:06
How long is the Earth's atmosphere?
the earth's atmosphere stretched to roughly 100km above the Earth's surface-that's alot of air!!!
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What causes Atmospheric Pressure?
The weight of all that air pushes down on the the air around us-creates atmospheric pressure
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What happens to atmospheric pressure with altitude?
The atmospheric pressure decreases with altitude because there's less air above you pressing down on you, the higher you are
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What is the atmospheric pressure at sea level?
over 100 000Pa
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What's the atmospheric pressure at the top of Mt.Everest (8800m above sea level)
33 000Pa
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Atmospheric pressure varies with height-the graph for this is curved. Why is this?
This is because atmospheric pressure is also affected by density
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What happens to the density of the atmosphere with altitude?
Density of atmosphere gets higher, closer you are to sea level/earth's surface. This is because the weight of the air above pushes down on the air below-compressing it. Closer you are to sea level, more air there's above you, so more compressed air
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What other factor affects the density of the atmosphere?
The temperature
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What is the equation for pressure in liquids?
Pressure(Pa)=height of column(m) x density of liquid(kg/m3) x gravitational field strength(N/kg)
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What is the gravitational field strength?
around 10N/kg
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Is liquid pressure equal in all directions?
Yes
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What happens to the pressure in liquids as you go further down?
Liquid pressure increases with depth
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Can liquids be compressed?
No
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Is the density the same everywhere in liquids?
yes-as they can't be compressed
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What is the equation you'll use to find the difference in pressure between 2 depths?
Difference in Pressure=difference in depth x density of liquid x gravitational field strenght
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How do you get Upthrust?
When the pushing upwards under the object is greater than the forcing pushing down on the object at the top of the object-so you get a upwards resultant force-aka Upthrust
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What determines whether an object floats?
if the upthrust acting on the object is equal to the weight of fluid the object has displaced. If this upthrust is equal to the object's weight, then object will FLOAT!!!
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Hence, how can you ensure an object floats?
Ensure to make it less dense than the liquid you're trying to float it on-so it will have displaced a volume of water equal to its own weight before its been completely submerged
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## Other cards in this set

### Card 2

#### Front

What causes Atmospheric Pressure?

#### Back

The weight of all that air pushes down on the the air around us-creates atmospheric pressure

### Card 3

#### Front

What happens to atmospheric pressure with altitude?

### Card 4

#### Front

What is the atmospheric pressure at sea level?

### Card 5

#### Front

What's the atmospheric pressure at the top of Mt.Everest (8800m above sea level)