DEVELOPMENT OF HOUSE HEATING 



135 



155. Relation of Pressure to the Temperature of Steam 

 Arising from Boiling Water. From many carefully performed 

 experiments, the exact relation of the pressure of water vapor, 

 or steam, to the temperature of boiling water has been, deter- 

 mined. We may speak of this relation in either of two ways: 

 First, we may speak of the boiling point of water under vary- 

 ing pressures, or second, we may speak of the vapor pressure 

 of water at varying temperatures. In either case we refer 

 to exactly the same relation. 



TABLE VI. BOILING POINT OF WATER AT DIFFERENT PRESSURES, OR 

 VAPOR PRESSURE OF WATER AT DIFFERENT TEMPERATURES 



156. Explanation of the Table. In the first column is given 

 the temperature of the steam arising from the boiling water; 

 this is practically the same as the temperature of the water. 



