To understand the effect of increasing the number of molecules on the pressure of a gas, we can refer to the ideal gas law, which states that P = (nRT)/V, where P is pressure, n is the number of moles (or molecules), R is the ideal gas constant, T is temperature, and V is volume.
In this scenario, volume and temperature are constant, meaning V and T do not change. If the number of molecules n is increased twofold, we can analyze its effect on pressure:
- If n doubles and remains the only variable changing, then according to the formula, the pressure P must also double, resulting in an increase in pressure.
The correct option in this case regarding how the pressure changes is not among the provided options. However, based on the understanding of gas laws, an increase in the number of gas molecules, while holding volume and temperature constant, results in an increase in pressure.