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# How Do Rain Clouds Form? - PowerPoint PPT Presentation

How Do Rain Clouds Form?. http://www.youtube.com/watch?v=1gvHpO26Xv4&feature=related http://www.youtube.com/watch?v=2sb58M1zIrY&feature=related http://www.youtube.com/watch?v=QH1yphfgfFI&feature=related. Changes in State / Phase of Matter. Compare and Contrast. Consumes Energy.

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## PowerPoint Slideshow about 'How Do Rain Clouds Form?' - emi-mann

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### How Do Rain Clouds Form?

ConsumesEnergy

Releases Energy

Freezing

Condensation

Deposition

• Melting

• Vaporization (Evaporation)

• Sublimation

### History

In ancient times, people used to put rocks from the fire into pools of water to warm the water up

The hot rock would pass energy to the cool water until they both had the same final temperature

heat energy will pass from the hot object to the cool object until the two objects are the same temperature

but the two objects don't necessarily have the same change in temperature

When you put an ice cube in a drink, the drink immediately begins to cool down, but the ice cube will remain at 0° C until it melts completely. How is this possible?

• The answer is that there is more energy in liquid water at 0°C than in solid water at 0°C.

• This extra energy in the liquid water is latent or hidden energy.

• For the solid to liquid (or liquid to solid) phase change, this hidden energy is potential energy and is called the latent heat of fusion

Changes in State of Matter 0°C than in solid water at 0°C.

Gas

Vaporization

Condensation

Liquid

Increasing Energy

Melting

Freezing

Sublimation

Solid

Increasing Particle Motion

### Phase Changes Due to Energy Gain 0°C than in solid water at 0°C.

Melting= solid  liquid

Vaporization= liquid  gas

### Phase Changes Due to Energy Loss 0°C than in solid water at 0°C.

Freezing= liquid  solid

Condensation= gas  liquid

The specific heat of liquid water is 1 calorie/gram °C, which is higher than any other common substance.

A joule (J) is the unit of energy used in the International System of Units

It takes 2.05 Joules/gram to raise ice by 1 degree C.

It takes 335.55 J/g to convert 0 degree ice to 0 degree water. This is known as the heat of fusion

It takes 4.18 J/g to raise the temperature of liquid water by 1 degree C.

It takes 2257 J/g to vaporize water - that is a lot!

Heat of Fusion and Vaporization which is higher than any other common substance.

Heat of Fusion

Heat of Vaporization

Heat of Fusion and Vaporization which is higher than any other common substance. (with y axis equalized on both sides)

Heat of Fusion

Heat of Vaporization

There will be a similar extra credit problem on the test which is higher than any other common substance. Melting= solid  liquid Sample problem: How many Joules would it take to raise a 1 gram piece of ice from -1 degree C to liquid water at 1 degree C?

It takes 2.05 Joules/gram to raise ice by 1 degree C.

It takes 335.55 J/g to convert 0 degree ice to 0 degree water. This is known as the heat of fusion

It takes 4.18 J/g to raise the temperature of liquid water by 1 degree C.

• Phase Changes and Steel which is higher than any other common substance.

• Melting Point: 1538°C or 2800°F

• Boiling Point: 2861°C or 5182°F

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