A YEAE IN SCIENCE 



31 



the result. Did the amount of water increase with the 

 increase of temperature ? Did it decrease with a lower 

 temperature? Then how do you explain the increase 

 and decrease in volume noted upon heating and cooling 

 respectively ? 



Exercise 11. Effect of Heat on Gases. 

 Object: To determine the effect of a change of 

 temperature upon the volume of gases. 



Tost tube 



( )ne-liole rubber stopper 



Bunsen burner 



Apparatus 



Beaker of colored liquid 

 Test tube clamp 



Directions: A. Fit the stopper with the glass tube 

 into the test tube as in the preceding exercise. With 

 wliat is the test tube filled? Is this a gas? See Exercise 



