How to Calculate Relative Humidity

Hello, in this video we are going to focus on how to calculate relative humidity

The formula for calculating relative humidity depends on the question that is available to you

For instance, we can say that the relative humidity, to calculate relative humidity

is equal to mass of water therefore in a given volume of air all over

Mass of water therefore required to saturate the same volume of air at the same temperature

which is m of a all over m of w times 100%

Another formula that we can use, we can say that actual volume of, or actual B4 fragile

relative humidity is equals to actual B4 fragile all over saturated B4 fragile, which

is sbp times hundred percent we can equally say that okay the formula for

relative humidity is before fragile which is the partial pressure all over

sbp at the same temperature of air let's just look at one of the examples for

one of the problems that we can apply some of these problems to solve

The table blue shows the saturation before fragile against in a particular city

If on a certain day the fragile or the before fragile in this city is 30 degrees Celsius

at 30 degrees Celsius is 22 millimeter mercury. What is the relative humidity The first thing we need to take care of is to understand that the bifo fragile is equal to which is at 30 degrees Celsius is equal to 22 millimeter mercury

and saturation bifo fragile sbv which is the saturation before fragile at 30 degrees Celsius

If you look at it, we have the temperature here and we have the saturation before fragile from this table

Therefore, at 30 degrees Celsius, which is 30 degrees Celsius, you come, this is the temperature at 0 degrees Celsius, 10 degrees Celsius, 20 degrees Celsius, 30 degrees Celsius

At 30 degrees Celsius, we have 31.8, which means the SPP is 31.8 mmHg

Remember that the SPP here is a mmHg, therefore we have 31.8 mmHg

To calculate relative humidity, relative humidity is equal to the formula that we have

We have relative humidity is equals to before fragile all over saturated before fragile which is the formula that we are supposed use times 100 percent remember that relative humidity is calculated in 100 in percentage therefore this is going to give us

Bifi is 22.0 mmHg over 31.8 mmHg times 100%

Therefore, this mmMg becomes a mmMg. And when you use your calculator, we are going to have something like this, which is going

to be 22 over the 12.8 times 100%. is going to give us 69.2% which is the relative immunity is 69.2

now let us take another example on a certain day the dew point is 10 degrees Celsius

The different is 10 degrees Celsius when certain temperature of the air is 32 degrees Celsius

Calculate the relative humidity of the air. To calculate the relative humidity of the air

SBP at 32 degrees Celsius and 10 degrees Celsius are we have SBP which is saturated before

friger is equal to at 32 degrees Celsius we have 16.2 mm mercury and SBP at 10 degrees

is equal to 9 mmM We are to calculate the relative humanity Now I want you to understand something

The formula in this case is equal to, remember on a certain day, the deal point is 10 degree Celsius

At deal point is 10 degree Celsius. Which means we are going to use the SPV

at dew point which is at 10 degrees Celsius which is SPV at 10 degrees Celsius

at 10 degrees Celsius all over SbV at 30 degrees Celsius times 100%

Therefore, in this case, we are going to have relative humidity is equals to this is equals to 9.8 mm

which is 9.8 mm mercury all over 16.2 mm which is SPP at 30 which is 16.2 mm

mercury times 100 percent therefore relative humidity when we use our

calculator calculator this is going to cancel each other we have 9.8 over 16

point two times 100 percent and this is going to give us 60 points

sorry let me rewrite it again This is going to give us 60.5% which is our relative immunity

Therefore, this is our relative immunity which is 60.5%