EXPERIMENT 4. CONVECTION OF HEAT 



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Set up the apparatus as shown in Figure 7. 



Fill the lower vessel with colored water and the upper 

 one with clear water. 

 Heat the lower vessel, 

 and the colored water 

 will show the direction 

 in which the current 

 flows. Explain why ~~I_ 

 the water flows as it does. 

 Draw in your laboratory book 

 a diagram, and show by means 

 of arrows the direction of the cur- 

 rent. 



Explain how convection is made use 

 of in the heating of buildings. 



FlG. 7. Currents caused by heat. 



