ve humidity is e/es x 100%. When e = es the air is completely saturated because looking back at the formula, one times one-hundred equals one-hundred percent which means the air is completely saturated. The relative humidity is dependent upon both temperature and vapor content. To increase the relative humidity it is necessary to increase vapor content and/ or cool the air. By increasing the vapor content, you are increasing the relative humidity/ saturation percentage. This is simple because your adding more thus making it more saturated. By decreasing the temperature you're simply decreasing the air's ability to saturate. Cold air can't hold as much water vapor as war air. In order to influence the relative humidity negatively it requires the inverse of the former concept. If you decrease the amount of vapor and/ or increase the temperature it decreases the relative humidity. The problem with using the relative humidity to judge the amount of water vapor is that there could technically be a situation where there is more vapor except the relative humidity is lower. This is because of the influence of temperature on the equation. If there it is a higher temperature then there is more saturation possible than lower temperature. So technically in a condition where there is the same amount of water vapor but there is two different temperatures, the higher temperature would have lower relative humidity then the colder temperate. This is a problem because there is now way to know this with looking at a thermometer
             ...