The density of a gas under constant pressure depends on temperature. Holding pressure constant at 14.5 pounds per square inch, a chemist measures the density of an oxygen sample at temperatures of 0, 22, 40, 70, and 100ºC and obtains densities of 1.411, 1.305, 1.229, 1.121, and 1.031 kg/m³, respectively.

(a) What is the domain and the range of the relation? 

(b) Express the relation using a mapping. 

(c) Express the relation as a set of ordered pairs.