Is there a formula given the temperature, dew point, and pressure to find relative humidity? I have seen several calculators like this one , but I would like to know how to calculate this myself. I am aware that there are several formulas that can calculate this with just the temperature and dew point, but since I'm writing a program, I would ...

2014年8月12日 · Then multiply the relative humidity times the saturation rate at that temperature. It's not precise, since there are many factors that vary, and you are approximating from a paper chart, but it's a good enough estimate for my work.

2020年12月14日 · I would like to find a formula to approximate RH based on known air temperature and dew point. I need the approximation to be valid at least between -20...+40 degrees Celsius.

2022年8月12日 · for ERA5 hourly data on single level relative humidity can not be downloaded. However, dewpoint temperature is given and in the description it is stated that "combined with temperature and pressure, it can be used to calculate the relative humidity". After some research I only found formulas that take temperature but not pressure into account.

2020年2月8日 · They give the psychometric equations that are required to calculate relative humidity from wet & dry bulb temperatures. For simplicity, I use the less accurate equations on p455, section 9.2. As a slight diversion, the other way to measure wet & dry bulb temperatures is to use a whirling hygrometer .

2015年6月28日 · I know there is this question already How do I convert Relative Humidity into specific humidity. but I don't have ρws = density of water vapor (kg/m3) and ρ = density of the moist or humid air (kg/m3). Is there another way to calculate it? Also I have air pressure but it's in the range of 95000-96000.

This excerpt from my undergrad tesis will explain the formula for absolute humidity. Once you know the absolute humidity, you can adapt the same formula to calculate the relative humidity of a parcel of outside air (of now known content of water), that is taken from outside to inside a building where its temperature risen to a new value.

2015年6月24日 · If we know the relative humidity of the moist air and the water vapor density and density of the air, the specific humidity can be expressed as: x = 0.622 φ ρws / (ρ - ρws) 100% (1) where x = specific humidity of air vapor mixture (kg/kg) φ = relative humidity (%) ρws = density of water vapor (kg/m3) ρ = density of the moist or humid air ...

The dew point is the temperature at which condensation appears. Therefore, for a given relative humidity, the hotter the air, the higher is the dew point. As you can see, in the Magnus approximation, the relationship is just a straight line, with a slope and constant changing for different values of the relative humidity.

2017年3月9日 · For example, I know that relative humidity can be estimated as: $$ RH = 100* \frac{... Skip to main content.