Properties of Water- Thermal

by Jason Amores Sumpter
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in this video, we're going to begin our lesson on the thermal properties of water. And so to understand the thermal properties of water, we need to understand kinetic energy and so kinetic energy is really just a measure of energy in the form of motion. And so if substances are moving, that means that they have kinetic energy. It's really the energy of motion. Now, temperature is a term that we've all heard before in our past. And really, temperature is just defined as the average kinetic energy of molecules in a solution, or in a sample. And so average here is really the key word. And so if a sample has a really, really high temperature, what that means is that the molecules in that sample have a high average motion. And so notice that these molecules in the sample have large arrows to represent the high average motion that they have. And so they're moving around a lot and very, very fast now. Low temperature on the other hand, of course, means that the samples the molecules in that sample have low average motion. And so notice that these molecules have small arrows to represent that they're moving very, very slowly in comparison to the high temperature samples. Now, temperature is not to be confused with thermal energy. So once again, temperature is the average kinetic energy. However, thermal energy is the total kinetic energy of molecules that's transferred specifically as heat. And so, if we take a look at our image down below over here on the right hand side, we could distinguish between temperature and thermal energy. And so notice that we're comparing two samples. Ah, hot coffee pot over here on the left hand side with, ah, large swimming pool over here on the right hand side. Now, of course, the hot coffee pot. If we measure its temperature, it's going to be quite high. It's gonna have a high temperature because the average kinetic energy, uh, in, um, these molecules is really, really high. They're moving really, really fast over here on average. And of course, the swimming pool over here is going to have low temperature. It's gonna be quite cool if you were to jump into that swimming pool, and that's because the molecules on average have low temperature. However, if we focus on the thermal energy, what we'll find is that the hot coffee pot because it has such a small volume, it actually has a lower thermal energy in comparison to the swimming pool over here, which has a much, much larger volume. And so the swimming pool over here is because it has so many more molecules. The total energy off all of these molecules adds up to B'more energy than the molecules over here in the hot coffee pot. And so that means that the swimming pool, simply because it has a much larger volume, has a higher thermal energy. Mawr. Total energy over here in the swimming pool because it has simply, ah, lot more molecules and the hot coffee pot, even though on average they have, ah, higher temperature MAWR motion TOTAL. There is a lot lower thermal energy in the hot coffee pot because it has such a small volume in comparison to this large swimming pool. And so this year concludes our introduction to kinetic energy temperature and thermal energy, and as we move forward in this lesson, we'll talk more specifically about waters thermal properties. So I'll see you all in our next video