"Design and Make a Thermos Cup" Hot PPT Courseware 2

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"Design and Make a Thermos Cup" Hot PPT Courseware 2

Pour the same amount of hot water of the same temperature into stainless steel cups, ceramic cups, and plastic cups of similar sizes.

After a few minutes, will the temperatures of these glasses of water be the same? Touch the wall of the cup with your hand. Which cup is colder?

Please note during the experiment:

The amount and temperature of water poured into the cup should be the same, the time taken to measure the water temperature should be the same, and a thermometer should be put in at the same time.

Compare which water temperature cools down faster?

Cup wall: Stainless steel cups are hot, followed by plastic cups, and ceramic cups are the coldest.

The heat transfer rate of stainless steel cups is faster than plastic cups and ceramic cups.

What do the temperatures of the three cup walls when you touch them with your hands indicate?

Metal absorbs heat quickly and the cup wall is very hot; plastic absorbs heat slowly and the cup wall is not very hot.

After a few minutes, will the three types of water have the same temperature?

no the same

Metal dissipates heat quickly and has poor thermal insulation effect;

Plastic dissipates heat slowly and has good thermal insulation effect.

The role of the thermos cup: it can only block heat transfer as much as possible, but in fact heat transfer will still occur.

When the temperature of the water in the thermos cup is higher than the outside temperature,

The function of the thermos cup: slow down the temperature drop of the water in the cup.

When the temperature of the water in the thermos cup is lower than the outside temperature,

The function of the thermos cup: slow down the temperature rise of the water in the cup.

think and explain

When the temperature is high in summer and sometimes there is a power outage, store staff will cover the freezer with a thick quilt to slow down the melting of the ice.

Quilts are not easy to conduct heat, and the outside heat is blocked by the quilts and cannot easily enter, so the popsicles melt slowly.

The weather is very cold in winter, so we should wear more clothes to avoid the cold.

Wearing more clothes in winter can effectively block the heat generated by the body from being transferred outward, so the body loses less heat and feels warmer.

Why don’t you fill your thermos bottle too full?

Don't fill the bottle too full with boiling water. The cork will conduct heat, so the water will cool quickly. You should leave some air under the cork. In this way, due to the poor thermal conductivity of air, the water will cool slowly. And because there is air left in the bottle, a large amount of air will be discharged from the bottle due to thermal expansion at first. Later, the temperature inside the bottle will drop, causing the atmospheric pressure inside the bottle to be lower than outside the bottle, and the bottle stopper will be tighter, which is more conducive to heat preservation.

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"Designing and Making a Thermos Cup" Hot PPT Part 1 Content: Which one cools slower? Pour the same amount of hot water of the same temperature into stainless steel cups, ceramic cups, and plastic cups of similar sizes. Then, touch the outer walls of various cups with your hands. What do you feel...

"Designing and Making a Thermos Cup" Hot PPT Courseware 4:

"Design and Make a Thermos Cup" Hot PPT Courseware 4 Knowledge Explanation Which one cools faster? What does the temperature of the three cup walls when you touch it with your hand indicate? Which one cools faster? Metal absorbs heat quickly and plastic absorbs heat slowly. After a few minutes, will the temperatures of the three types of water be the same? ..

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Update Time: 2024-11-17

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