- #1

Zewz

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**1. I am supposed to calculate the mass of water vapour in one cubic meter of air that has a relative humidity of 80% at 20°C.**

**2. p[v] = (eM[w]) / (RT)**

Where:

p[v] = vapour density

e = water vapour pressure

M[w] = molar mass of water

R = gas constant (8,314 J / (mol*K)

T = temperature (293,15°K)

Where:

p[v] = vapour density

e = water vapour pressure

M[w] = molar mass of water

R = gas constant (8,314 J / (mol*K)

T = temperature (293,15°K)

**3. I am struggling with in what unit the vapour density should be measured, as well as the pressure, Pascal? I know this problem is embarrassingly easy, but I've been trying to get the answer for several days, reading up on it online... I miss my old physics-book!**

Help would be sincerely appreciated!

Help would be sincerely appreciated!