Chapter 2: revision questions

27 Chapter 2: revision questions

• Define combustion.

燃烧是一个化学反应过程，主要有可燃物，助燃物和点火源参与，生成产物主要是光和热

• Explain the difference between complete and incomplete combustion.

完全燃烧和不完全燃烧，最大的区别在于氧气供应是否充足，如果因为氧气供应不足，导致燃烧中断，就是不完全燃烧

• What are fuels known as that release oxygen when subjected to heat?

过氧化物

• Define pyrolysis.

可燃物受热以后发生分解，产生可燃性气体

• Explain the difference between heat and temperature.

热量测量能量,温度测量分子运动

• Define the terms ‘flash point’，‘fire point’ and ‘auto-ignition temperature’.

闪点：可燃物表面发生一闪即灭现象的温度；
燃点：支撑可燃物燃烧的温度;
自燃温度：可燃物达到一定温度，自行燃烧；

• What is heat release rate (HRR) and give two examples that affect it?

单位时间内可燃物燃烧释放的热量;可燃物的形状，以及表面积都会影响HRR

• What is the term that refers to measuring heat transfer in known timescales and over known measured areas?

单位时间内通过，可燃物横截面上的热量，热通量

• List the three types of heat transfers with examples.

热传导、热对流、热辐射
传导主要是固体接触，对流主要在液体和气体中，辐射无处不在

• What is the name for materials that do not conduct heat energy well?

绝缘

• Which of the heat transfer processes is the biggest contributor to fire development?

热辐射