Heat

Introduction

In this Webquest we will learn about Heat. 

Heat is a form of energy that causes in us a sensation of hotness or coldness.

Task

 

What heats faster, land or water? You will answer this question by taking measurements to study differences in specific heat capacity.

Warnings

  • Open flame—Tie back all loose hair and clothing before igniting an open flame. Follow all of your teacher's instructions on how to ignite the flame. Never leave an open flame unattended. Know the location of fire safety equipment in the laboratory.

Materials

  • Sand or soil
  • Water
  • Oven or heat lamp
  • Two small jars
  • Two thermometers

Instructions

Procedure

  1. Place equal masses of dry sand (or soil) and water at the same temperature into two small jars. (The average density of soil or sand is about 1.6 times that of water, so you can get equal masses by using 50 percent more water by volume.)
  2. Heat both substances (using an oven or a heat lamp) for the same amount of time.
  3. Record the final temperatures of the two masses.
  4. Now bring both jars to the same temperature by heating for a longer period of time.
  5. Remove the jars from the heat source and measure their temperature every 5 minutes for about 30 minutes.

Grasp Check

Did it take longer to heat the water or the sand/soil to the same temperature? Which sample took longer to cool? What does this experiment tell us about how the specific heat of water compared to the specific heat of land?

  1. The sand/soil will take longer to heat as well as to cool. This tells us that the specific heat of land is greater than that of water.
  2. The sand/soil will take longer to heat as well as to cool. This tells us that the specific heat of water is greater than that of land.
  3. The water will take longer to heat as well as to cool. This tells us that the specific heat of land is greater than that of water.
  4. The water will take longer to heat as well as to cool. This tells us that the specific heat of water is greater than that of land.

Process

HEAT TRANSFER

Heat travels from a hotter region to a cooler region .

The flow of heat from one place to another is called Heat Transfer.

Watch this video to learn about

Convection:

https://www.youtube.com/watch?v=0CxkdJeqNfM&t=117s

Conduction: 

https://www.youtube.com/watch?v=w_IbPRNZ6ho

 

Specific Heat:

https://www.youtube.com/watch?v=TqJFIBODrjM

 

Evaluation

Conclusion

There are three modes of heat transfer. Heat transfer or transmission of heat from one place to another takes place by three different ways that are:

  1. Conduction
  2. Convection 
  3. Radiation

In solids, heat passes from one point to another through conduction. In Liquids and gases, heat transfer takes place by convection. Heat transfer takes place by the process of radiation when there are no particles of any kind which can move and transfer heat. So, in an empty space or vacuum heat is transferred by radiation.

The land gets heated up by the heat radiated by the sun, much faster than the water during daytime.

The land gets cooled down much faster than the water during night.

 

Credits