absolute zero - the lowest temperature that is theoretically possible, equivalent to 273.15 °C, atmosphere - the layer of air, including oxygen, nitrogen, carbon dioxide, and other gases, above the Earth’s surface, atmospheric pressure - the gas pressure caused by the atmosphere due to the density of the air at that height, equal to approximately 100kPa at the surface of the Earth, gas pressure - the pressure exerted by a gas due to the collisions of the particles in the gas with the container, inversely proportional - this is when one value increases as another value decreases in the same ratio, liquid pressure - the pressure in a liquid due to the weight of the liquid above it, pascal (Pa) - the unit of pressure; 1 Pa is equal to 1 N/m2, upthrust - the force of an object in a fluid due to the difference in pressure in the fluid acting on the area of the object,

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