タイトルどうり！
何でも聞いて！
Becauseを先頭にするのはよくなくて、するから接続詞として使うべきということは確かにその通りだなって思った。ありがとうございます。
The reason why とか Because of も良さげだけど色んな人（アメリカ人や教授も含む）に聞いてみた結果、sinceがやはり良いらしい。
今回は導入部について御二方の協力があったことはかなり嬉しかったので、感謝申し上げます。
Since the temperature change of the specific heat of water is small, the temperature rises almost linearly in proportion to the heating amount.
When the temperature is changed to the saturation temperature (100 ° C.), evaporation starts while maintaining the same state. This is the state where water and steam exist at the same time and this condition is called wet steam. The mass of steam contained in 1 kg of wet steam is defined as dryness fraction, and that is usually represented by x.
Further heating will turn all the water into a steamed state. This condition is called dry saturated vapor. The dry saturated steam continues to rise in temperature again when it is heated and this state is called heating steam. The temperature difference with the saturation temperature is called the degree of superheat. The higher the temperature, the closer the vapor is to being a perfect gas.
が改訂版ってことで