Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature
Answers
Answered by
6
Hey mate!
Here's your answer!!
Here heat is being trans by conduction from the air.
Experiment:
◾️Heat absorber
You need
Rubbing alcohol
Skin (your arm will do fine)
Procedure:
1. Put a small amount of rubbing alcohol on your arm.
2. Wait....
3. How does your arm feel? Warm or cold?
Well, alcohol is a liquid with a fairly low boiling point. In other words, it goes from liquid to gas at a fairly low temperature. The heat from your body is more then enough to make the alcohol evaporate. As the alcohol went from liquid to gas it sucked heat out of your body. For things to evaporate, they must suck in heat from their surroundings to change state. As the alcohol evaporated you felt cold where the alcohol was. This is because the alcohol was sucking the heat energy out of that part of your body (heat was being transfered by conduction) and causing that part of your body to decrease in temperature.
Things release heat as they change to a liquid state. The water gas that condenses on your mirror actually increases the temperature of that mirror. This is why steam can be quite dangerous. Not only is it hot to begin with, but if it condenses on your skin it releases even more heat which can give you severe burns. Objects absorb heat when they melt and evaporate/boil. Objects release heat when they freeze and condense.
✌ ✌ ✌
Here's your answer!!
Here heat is being trans by conduction from the air.
Experiment:
◾️Heat absorber
You need
Rubbing alcohol
Skin (your arm will do fine)
Procedure:
1. Put a small amount of rubbing alcohol on your arm.
2. Wait....
3. How does your arm feel? Warm or cold?
Well, alcohol is a liquid with a fairly low boiling point. In other words, it goes from liquid to gas at a fairly low temperature. The heat from your body is more then enough to make the alcohol evaporate. As the alcohol went from liquid to gas it sucked heat out of your body. For things to evaporate, they must suck in heat from their surroundings to change state. As the alcohol evaporated you felt cold where the alcohol was. This is because the alcohol was sucking the heat energy out of that part of your body (heat was being transfered by conduction) and causing that part of your body to decrease in temperature.
Things release heat as they change to a liquid state. The water gas that condenses on your mirror actually increases the temperature of that mirror. This is why steam can be quite dangerous. Not only is it hot to begin with, but if it condenses on your skin it releases even more heat which can give you severe burns. Objects absorb heat when they melt and evaporate/boil. Objects release heat when they freeze and condense.
✌ ✌ ✌
Similar questions