WATER. 



34. Water is a Liquid. 



A block of wood, or a stone, has a shape which does 

 not change. What is the shape of a quart of water? 

 Water will fit any dish that you put it into, and thus has 

 no shape of its own. Anything which has a shape which 

 does not change is called a solid. If the material fits the 

 dish into which it is put and leaves no empty spaces, it 

 is a liquid. 



While water is a liquid and fits perfectly every dish 

 into which it may be put, there is one part which is 

 always the same. This is the top of the water, called its 

 surface. The surface of water is always flat, or hori- 

 zontal. Another name for horizontal, is level. All 

 parts of a horizontal, or a level line are the same distance 

 from the center of the earth. If we want to make the 

 floor of a house level we can do so by means of a hori- 

 zontal surface of water. 



Experiment 43. The Level. 



Apparatus: Pie tin, small round bottle and stopple. 



a. Half fill the pie tin with water and place it upon 

 the board which you are to make level. If the water 

 does not come up the same distance all around the tin, 

 when it is on the board, the board is not level, or hori- 

 zontal. Put little pieces of wood or stones, under the 

 low sides of the board until the water is at the same 

 height all around the tin. Can a board be horizontal in 

 one direction, say north and south, and not horizontal in 



