Which of the following correctly states a gas law related to pressure and density?

The correct statement reflects a fundamental principle of the relationship between pressure and density as defined by the ideal gas law. According to this law, for a fixed amount of gas at a constant temperature, an increase in pressure results in an increase in density. This is because density is directly related to the mass of the gas present in a given volume; thus, if pressure doubles while temperature remains constant, the gas is compressed into half the volume. Since density is mass divided by volume, densifying the gas leads to a direct doubling of density.

To provide better context, the other statements about the relationships of temperature and pressure with density do not accurately reflect the established gas laws. For example, if temperature increases, density typically decreases because warmer gases expand, occupying a larger volume. When examining the relationship between pressure and density, it’s important to recognize that under constant temperature conditions, increased pressure means molecules are forced closer together, increasing the density of the gas.