Term
| Explain what happens to the mercury in a barometer when pressure increases. |
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Definition
| A barometer is used to measure atmospheric pressure. When pressure increases the molecules in the air exert a downward on the force on the mercury in the barometer pushing it up the tube, giving a higher reading. At sea level the pressure is 760mm of mercury. |
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Term
| How does the density of a liquid of a liquid relate to the pressure it exerts, and what formula is related to it? |
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Definition
A liquid with a greater density will exert a greater pressure. This is because there is more mass of the liquid at even the same depth, creating a higher gravity force pushing down on the same area, thus greater pressure.
p= ρxgxh densityxgravityxheight |
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Term
| Explain the molecules in a liquid, mention volume. |
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Definition
| The molecules in a liquid have a fixed volume depending on its container. They have no fixed pattern. The molecules slide past each other. |
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Term
| The amount of heat required to heat a 1kg object by 1℃ is called what? |
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Definition
Specific heat capacity is the amount of heat required to heat an 1 kg object by 1℃
Formula, q=mc∆t |
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Term
| The amount of energy required to convert 1kg of a substance from liquid to gas and gas liquid is called what? |
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Definition
It is called the latent heat of vaporisation. When you change the state of a substance you only change the potential energy.
Formula
L=Q/m |
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