Boyle's law states that at constant temperature, the pressure and volume of a gas are inversely proportional. Charles's law states that at constant pr
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Why do pressure cookers reduce cooking time if temperature only increases by about 20°C?
The chemical reaction rates in cooking roughly double for every 10°C temperature increase. A 20°C increase means roughly 4 times faster reactions. Additionally, higher temperature transfers heat to food faster. Together, these effects reduce cooking time to about 1/3, even though temperature increase seems small.
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Do these laws work perfectly for all gases?
These laws work very well for ideal gases. Real gases deviate at high pressure or low temperature when intermolecular forces become significant and molecular volume becomes important. For air at room temperature and normal pressure, the laws are very accurate.
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What is absolute zero, and why is it important for gas laws?
Absolute zero is -273.15°C or 0 K, the theoretical lowest temperature where molecular motion completely stops. Gas laws use Kelvin temperature because the relationships (P and V) are directly proportional to absolute temperature. At absolute zero, molecular motion ceases, which is physically impossible to achieve but is the reference point for the Kelvin scale.
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