673880
Description
Flashcards by Ali Dragozova, updated more than 1 year ago
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Created by Ali Dragozova
over 12 years ago
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| Question | Answer |
| Define Pressure. What are the units of pressure? | The amount of force acting on a unit of area. N/cm2 (newton,cm,squared) |
| Give 3 formulas from the triangle of pressure. | force/area =pressure pressure x area=force force/pressure= area |
| The pressure due to a force depends on 2 factors, name them. | 1.Pressure increases when the force increases. 2.Pressure increases when the area that the force is acting on decreases |
| How does pressure vary with depth in liquids?Give examples of this. | The value of pressure will increase as you go deeper below the surface of a liquid. * A dam wall is thicker at the base then at the top. |
| What is atmospheric pressure? | The pressure due to the WEIGHT of the gases PUSHING down on the earth. |
| How does atmospheric pressure vary with height? | *It decreases with height above sea level. |
| Where is pressure greatest- at the top of a mountain or at sea level. Why? | At sea level. There is more pressure ,because there is more gases pushing down on you. |
| How do you measure pressure? Name 2 types. | A barometer is used. 1)Anaeroid barometer 2)Mercury barometer |
| What are isobars? | Lines on a weather chart that joins areas with equal atmospheric pressure |
| How do you measure altitude? | An altimeter is used. |
| When the pressure is: a)high b)low what will the weather be like? | a)clear,settled,dry b)wet,windy,dull |
| What does it mean when isobars are a)close together b)far apart | a)the winds will be strong b)the winds will be light |
| What is the normal atmospheric pressure? | 1014 hPa hPa-hectopascal=unit of A.P |
| What are applications of pressure? | 1)water supply systems-the greater the height of the reservoir the greater the pressure. 2)Hydraulics-Liquids used to create large pressures in machinery. |
| Why is low atmospheric pressure associated with bad weather? | Low A.P means that it is easier for water to evaporate into the air because the 'blanket' of A.P pressing down on the water is lighter. |
| Increased pressure, increased....... Decreased pressure, decreased...... | increased...boiling point decreased....boiling point |
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