Term
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Definition
| The result of the constant collisions between the atoms or molecules in a gas and the surfaces around them. |
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Term
| What are high pressure weather systems usually associated with? |
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Definition
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Term
| What are low pressure weather systems usually associated with? |
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Definition
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Term
| What is the relationship between the number of gas particles and the pressure? |
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Definition
| The fewer the gas particles, the lower the pressure. |
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Term
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Definition
| A barometer is an evacuated glass tube, the tip of which is submerged in a pool of mercury. |
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Term
| When the atmospheric pressure rises, what happens to the height of the mercury column in a barometer? |
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Definition
| The height of the mercury column rises. |
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Term
| When the atmospheric pressure falls, what happens to the height of the mercury column in a barometer? |
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Definition
| The height of the column falls. |
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Term
| What is a millimetre of mercury often called? |
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Definition
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Term
| What is standard pressure? |
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Definition
| Exactly 100, 000Pa or 1bar. |
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Term
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Definition
| A manometer is a U-shaped tube containing a dense liquid, usually mercury. |
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Term
| If the atmospheric pressure is equal to the gas pressure, what happens to the mercury levels in a manometer? |
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Definition
| The mercury levels on both sides of the tube are the same. |
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Term
| If the gas pressure is greater than the atmospheric pressure, what happens to the mercury levels in a manometer? |
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Definition
| The mercury level on the open-side of the tube is higher than the gas-side. |
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Term
| If the gas pressure is less than the atmospheric pressure, what happens to the mercury levels in a manometer? |
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Definition
| The mercury level on the gas-side will be higher than the open-side. |
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Term
| In a manometer, what does the difference in height of the mercury levels represent? |
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Definition
| The difference in height is equal to the difference between the gas's pressure and the atmospheric pressure. |
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