Sentence:  <WSD>Heat</WSD> and temperature, although different, are intimately related. [...] For example, suppose you added equal amounts of <WSD>heat</WSD> to equal masses of iron and aluminum. How do you think their temperatures would change?...if the temperature of the iron increased by 100 C°, the corresponding temperature change in the aluminum would be only 48 C°. 
Meaning of the word marked with <WSD> tags:  Thermal energy.