Like what you saw?
Create FREE Account and:
- Watch all FREE content in 21 subjects(388 videos for 23 hours)
- FREE advice on how to get better grades at school from an expert
- FREE study tips and eBooks on various topics
Entropy - Entropy
M.Ed., George Washington University
Dept. chair at a high school
Matt is currently the department chair at a high school in San Francisco. In his spare time, Matt enjoys spending time outdoors with his wife and two kids.
Entropy measures the amount of disorder in a system. Nature tends towards disorder, so as time elapses, entropy naturally increases. Energy is required in order to decrease entropy.
Entropy, when I think of entropy I think of my four year old daughter, if she comes into her room no matter how clean it is, pretty soon it's chaos and disorder and we've got to go in there and kind of fix everything up and kind of straighten it out so basically entropy is the amount of disorder within a system.
So let's look at an example of entropy, let's say I've got water and I've got that water frozen in a nice little ice cube okay and this ice cube has a lot of order and a lot of structure and all these molecules are held together in these very tight precise bonds okay, now if we let that ice cube melt, it's going to gain entropy it's starting to gain energy and it's starting to move around and it's losing that order and that structure it's moving towards disorder and so now our ice cube, I'm going to put it in a little cup, is going to become water with more energy and more motion and more disorder. If we let that continue to evaporate, it's going to turn into water vapor and it's going to become all the molecules in air in water vapor and that's got a lot of energy and a lot of disorder and those molecules are going everywhere and bouncing and colliding in to other things, so that is the a system with a lot of disorder high entropy. But as the water is going from order to disorder that energy is also causing an increase in entropy in the air molecules around it as the ice is melting the air around it is, is getting cooler and that's causing a decrease in Entropy and as water evaporates, that evaporate of cooling is cooling off the air which causes a decrease in entropy in the air so entropy can go in two directions and often times it goes in two complimentary directions as one thing heats up and another cools off.
Please enter your name.
Are you sure you want to delete this comment?
- Conservation of Energy 28,692 views
- Specific Heat 28,597 views
- Bomb Calorimeters 18,615 views
- Enthalpy 27,113 views
- Thermochemical Equation 19,184 views
- Hess's Law 25,480 views
- Spontaneous Process 12,989 views
- Heat of Formation 15,267 views
- Gibbs Free Energy 15,212 views
- Heat of Fusion - Heat of Vaporization 27,548 views
- Deciding if a Reaction is Spontaneous 5,736 views
- Tips on Deciphering and Interpreting Delta H 4,272 views
- Understanding the Difference between Delta H and Delta S 24,497 views
- Tips on Understanding the Difference Between Calorimeters 4,252 views
- Tips on When to Use Specific Heat 3,825 views
- Second Law of Thermodynamics 25,752 views