Homework: Textbook pages 278-284 #1-4

Follow the Low Pressure System

When the air is completely full of water it is considered?

Name the instrument used to measure HUMIDITY?

What is the relative humidity outside, right now?

Dew Point Temperature

Air temp = 28 Dew Point temp = 21High or Low pressure? Will a wet towel dry

quickly or slowly today?

Air temp 14 Dew Point temp 14Pressure system? Towel dry fast or slow

Think about this. If it is raining out, will there be a lot of evaporation taking place

Ever notice how you feel cold when you get out of the shower or pool?

That’s because evaporation is a heating process.

Water needs heat in order to evaporate and therefore it gets the

heat from your Body.

The same thing happens when you use a sling psychrometer.

Because evaporation is pulling the heat out of the thermometer, the wet bulb is always colder than the

dry bulb (or the same temp)

So what will happen to the wet bulb temperature?

Find the Dew Point for the following.

Dry bulb temp =-8 Wet Bulb = -9

Dry Bulb = 20 Wet Bulb = 16

Dry bulb = 2 R.H = 67. What is the Wet bulb Temp?

Dry Bulb = 16, Dew Point = 11, what is the Relative Humidity?