284 



Domestic Science 



contained within the side tubes. At the same time 

 the liquid rises in the centre tube. Allow the action 

 to go on until one of the tubes is filled with gas. Dis- 

 connect the supply of electricity. It will be noted that 

 almost exactly half the other tube is filled with gas. 

 The nature of the gas produced in larger quantity may 

 be ascertained by partly opening the tap at the top 

 of the tube and applying a lighted taper to the jet. 



Fig. 92. 



An almost colourless flame that of burning hydrogen 

 is seen. Turn off the tap as soon as the liquid reaches 

 the top of the tube. Next partially open the tap of 

 the other tube and hold a glowing splint over the end of 

 the jet. The issuing gas will at once reignite the splint. 

 This we know to be a characteristic property of oxygen. 



