HEAT. 



TABLE of the Elastic forces of the Vapours of Alcohol, Ether, Oil of Turpentine, 

 Petroleum, or Naphtha, by Dr. Ure. 



Fig. 17- 



The low temperature at which water great violence, and will continue until 

 boils in vacuo, may be illustrated by the water in the flask is nearly cold, 

 another experiment. 



Ex. Adapt a good cork covered on 

 the upper part with a thick coating of 

 sealing-wax, to a glass flask with a 

 long neck a (fig. 17); put water 

 to the depth of about an inch and a 

 half into it, and apply the heat of a 

 spirit-lamp until it boils ; permit the 

 boiling to continue for a short time, and 

 then, having put on a worsted glove, in- 

 troduce the cork ; press it down, and re- 

 move the flask from the lamp. The 

 water will boil a little after the heat 

 ceases to be applied. On plunging the 

 flask into the jar b, containing cold 

 Water, the boiling will recommence with 



