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What belongs in each mystery box?

Every mystery box holds the same value. Make the two sides balance.

5 × ? + 666Equal values make a level balance.

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ScienceAges 16-18Physics (O Level): Thermal physics
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Boyle’s law & gas compression

A sealed cylinder contains 84 dm³ of ideal gas at an initial pressure of 245 kPa. The gas is compressed at constant temperature to a volume of 12 dm³. Using Boyle’s law (P₁V₁ = P₂V₂), calculate the final pressure.

Apply Boyle’s law (P₁V₁ = P₂V₂) to calculate the pressure of an ideal gas after isothermal compression.

P₁ = 245 kPa, V₁ = 84 dm³ · Compressed to V₂ = 12 dm³ → P₂ = ?
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