Transcript
Page 1: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Humidity and Condensation

After completing this section, students will compare the physical characteristics of the three states of water

(Standard PI – 053)

Page 2: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

After completing this section students will:

• Compare the physical characteristics of the three states of water (PI Standard – 053)

• Explain the formation of the different types of clouds and the type of weather associated with those clouds (PI Standard – 055)

Page 3: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Molecules of water are moving through the air

around us

This water vapor strongly affects the weather

Page 4: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Water is unique. It is the only substance that exists

commonly in all three states

The state of matter depends on the temperature of water

Page 5: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Water is in solid state at temperatures of zero degrees

Celsius or below

It can occur as ice, snow, sleet or ice crystals

Page 6: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Water is in liquid state between zero degrees and

100 degrees Celsius

It occurs as cloud droplets or rain

Page 7: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Water occurs as a gas at 100 degrees Celsius or above, as

water vapor

It occurs as clouds and steam

Page 8: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Water changes state in the atmosphere when it absorbs

or gives off heat

Page 9: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Condensation is the change from water vapor (gas) to a

liquid

Condensation can form fog, dew and clouds

Page 10: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Evaporation is when a liquid changes into a gas (water

vapor)

Page 11: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Humidity

Page 12: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

The amount of water vapor in the atmosphere varies

The actual amount of water vapor in the atmosphere at a given time and place is

called specific humidity

Page 13: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

The amount of water in the air depends on temperature

The warmer the air, the more water vapor it can hold

Page 14: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Relative humidity compares the actual amount of water in the air to

how much it can hold at a given temperature

Measured with a psychrometer and written as a percentage

Page 15: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Condensation occurs when the air temperature cools past

the point of saturation

Dew point – the temperature at which saturation occurs

Page 16: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

For condensation to occur, two conditions are necessary

• There must be material for water vapor to condense onto (condensation nuclei)

• The air must cool below its dew point

Page 17: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

When condensation occurs, dew or frost can form

Dew occurs when the air temperature is above freezing, frost occurs below zero

Page 18: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Radiation fog occurs when the ground loses heat rapidly and

cools the air above it

Occurs near rivers and lakes and usually occur in late fall and winter

Page 19: Humidity and Condensation After completing this section, students will compare the physical characteristics of the three states of water (Standard PI –

Advection fog occurs when warm moist air moves over a

cool surface

Usually thickest in early morning and ‘burns off’ in the late morning


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