【名师带你背单词】Retell Lecture真题《Bomb calorimeter》,曼拓教育微信公众号文章

Dina老师

今天我们来看看这篇在PTE听力中常考的科学类文章。

Retell lecture 真题：Bomb calorimeter

来源：PTE考试真题

Dina老师

下面带着对这些单词和短语的理解，尝试读一读下面的原文，看看是不是容易理解多了呢？

Yeah this is a bomb calorimeter. This is the actual piece of equipment that researchers used to calculate the energy content of either biodiesel or maybe even the potato chips that you had for lunch today. When they calculate the amount of energy, they're going to calculate it in heat units, which would either be joules or calories. I want you to look inside the bomb calorimeter. Inside here you can see that there's a silver bucket water goes all in here and this is actually the bomb is the smaller silver cylinder. What you do is put your fuel sample in there then these two electrodes are connected to the bomb. These provide the spark that will ignite your sample. When your sample burns or combust that gives off energy.So how is the energy collected or how did how does a scientist figure out how much energy is being given off? Well it's a closed system. There's a lid here that goes on top of this calorimeter and what's in here. In the lid is a stir. The stir is going to stir the water, that's in this big pool here, so that the heat given off from the sample is going to warm the water in a uniform way. This is the temperature probe. This goes down in the water also and measures the change in temperature because as the sample is burned, it will give off heat and the temperature of the water will increase. So the lid goes on the sample is prepared. The last thing that you need to make a combustion reaction happen is oxygen and at some point during the process, some oxygen is added by a tank that's connected to the calorimeter. So we are going to burn a sample of the biodiesel that you've prepared and get some feedback on the energy content of it you'll be able to use this to compare it to petroleum-based fuels like octane.

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