Question

which of the following will decrease the pressure of a gas in a closed container? a increasing the temperature b increasing the volume c increasing the amount of light d increasing the number of molecules

Explanation:

To determine which factor decreases gas pressure in a closed container, we use gas laws (like Boyle's Law or the ideal gas law \( PV = nRT \), where \( P \) is pressure, \( V \) is volume, \( n \) is moles, \( R \) is gas constant, \( T \) is temperature).

• Option A: Increasing temperature (\( T \)) increases pressure (since \( P \propto T \) at constant \( V, n \)).
• Option B: Increasing volume (\( V \)) decreases pressure (Boyle's Law: \( P \propto \frac{1}{V} \) at constant \( T, n \)).
• Option C: Light does not directly affect gas pressure (no relation to gas pressure factors).
• Option D: Increasing molecules (\( n \)) increases pressure (since \( P \propto n \) at constant \( V, T \)).

Answer:

B. increasing the volume