PTE Practice Test 3 – Speaking (Retell Lecture) – Audio With Transcript

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 off so 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 here so we are going to burn a sample of the bio-diesel 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

USA Today is now more than 25 years old. When it began, few expected it would last this long. Well, not only has it lasted, it has thrived. USA Today is the largest-selling daily newspaper in America. It is also distributed in many countries around the world. But that’s only part of the story.

The real success of USA Today is the way it changed the newspaper industry. USA Today changed the way papers look. It changed the way reporters write. And it changed the way papers gather and deliver the news.

USA Today set out to be different. Newspapers at that time were, um, in trouble. Fewer people were reading them. The papers were full of bad news about crime and killing. They had long stories. They didn’t have color photos and graphics, and many could not include the latest sports scores. USA Today changed all that. It had shorter stories, most of which did not jump, or continue, from one page to another. It used color photos, and colorful charts and graphics. It did not have much international news, but it did have lots of sports, entertainment and human-interest stories. It was trying to appeal to younger readers. These readers had been raised watching television, so they had trouble, uh, paying attention to longer stories. They wanted, erm, to be entertained, not informed. At first, many people laughed at USA Today. Other newspapers called it “McPaper.” They were comparing it to McDonald’s fast food, which isn’t, um, very healthy. It fills you up, but it doesn’t have much nutrition. They said McPaper was the same way — it looked good, but the news it had wasn’t very important.