At a temperature of 10°C the percent relative humidity is R10, and at 40°C it is R40. At each of these temperatures the partial pressure of water vapor in the air is the same. Using the vapor pressure curve for water that accompanies this problem, determine the ratio R10/R40 of the two humidity values.

answer; ///i do believe that the correct answer is ; ///(physical change);

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.