Question

A sling psychrometer reads dry and wet bulb temperatures of 30 and 20°C respectively. What is the relative humidity of the air?

Answer 1

40%

Step-by-step explanation:

Given that

Dry bulb temperature=30°C or 86 F

wet bulb temperature=20°C or 68 F

Now to find the relative humidity of air we will use the relative humidity chart.

We know that relative humidity chart is the chart between dry bulb temperature and humidity ratio.

Vertical lines is for Dry bulb temperature and incline lines for wet bulb temperature and curve is relative humidity lines.At which points these two lines will cut then the relative humidity at that point will be our answer.

So from chart we can say that relative humidity is about 40%.