"Where Do Water Drops Come From" Changes in Temperature and Water PPT

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"Where Do Water Drops Come From" Changes in Temperature and Water PPT

Part One: Importing New Knowledge

Take a guess

What will appear on the surface of fruit after taking it out of the refrigerator for a while?

Many small water droplets will appear on the surface!

If a glass filled with ice is left in the air, what will appear outside the glass after a while?

There are many small water droplets on the outside of the cup.

Where do water droplets come from PPT, part 2: new knowledge explanation

1. Are water drops formed from ice?

Take a guess

Where do the small water droplets on the outer wall of the ice glass come from?

Probably seeping out of the cup.

It couldn't have leaked from the cup, because the glass was impermeable.

The ice melts into water and overflows from the mouth of the cup.

It couldn't have overflowed from the cup, because the water in the cup wasn't full when the ice melted, so it couldn't have overflowed.

It may be that when adding ice, the ice cubes hit the rim of the glass and turned into water and flowed down.

It couldn't be that when adding ice, the ice cubes hit the rim of the glass and turned into water and flowed down. Because when adding ice, you usually add it carefully into the cup.

we come to the conclusion

The small water droplets on the outer wall of the glass are not formed by the melting of ice inside the glass. The water droplets must come from outside the cup (water vapor)

There are many small water droplets on the outer wall of the glass filled with ice. Is it related to the ice in the glass?

2. Is the formation of water droplets related to ice?

Group discussion: Can you design an experiment to prove whether the formation of water droplets is related to ice.

Take three identical glasses, add tap water to one of them, add nothing to one, add ice to the other, and place them quietly on the table.

Where do water droplets come from PPT, part 3: Consolidation exercises

1. After experimental observation, we found that: ______ (fill in "yes" or "no") water droplets are produced on the outer wall of the cup with ice, and _______ (fill in "yes" or "no") water droplets are produced on the outer wall of the cup without ice. produce.

2. Water beads appear on the surface of the ice cream packaging bag taken out of the freezer. On autumn mornings, water beads appear on the grass on the roadside. Water beads appear on the outside of the refrigerator door. (fill in yes or no ).

3. We know that the water droplets on the outer wall of the ice-filled glass come from the water vapor in the air. So, under what circumstances does this mean that water vapor will turn into small water droplets? ( )

A. In the cold

B. When exposed to heat

C. Both

4. On summer mornings, water droplets will also appear on the glass windows of air-conditioned rooms. These water droplets appear on the glass windows ( ).

A． outside

B. inside

C. both sides

Where do water droplets come from PPT, part 4 content: Class summary

1. The small water droplets on the outer wall of the glass are not caused by the melting of ice inside the glass.

2. The small water droplets on the outer wall of the glass are related to the ice inside the glass.

3. The water droplets on the outer wall of the glass are: water vapor in the air encounters the cold wall of the glass, and the water vapor cools quickly and condenses into liquid.

Where do water drops come from PPT, part 5: blackboard writing

1. Are water drops formed from ice?

The small water droplets on the outer wall of the glass are not formed by the melting of ice inside the glass.

2. Is the formation of water droplets related to ice?

1. Only the outer wall of the glass filled with ice has many small water droplets, which means that the small water droplets on the outer wall of the glass are related to the ice inside the glass.

2. The water droplets on the outer wall of the glass are caused by water vapor in the air encountering the cold wall of the glass. The water vapor cools rapidly and condenses into liquid.

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Update Time: 2024-11-25

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