week 2 day 1

This day, we were still on thermal dynamics. We focused on the same gas but different conditions in terms of pressure, volume, and temperature.

The first little lab was that heating up a can with half filled with water, then put the can into cold water facing down. The can squized. when the can was heat up, the water molecules take more space. but when its put into  cold water, temperature dramaticly decreases. PV have to decrease too based on p1v1/t1=p2v2/t2.

Then we heated up the can with only air inside. then we put it into cold water facing down. the can didnt change shape, but it sucked up some water into the can. When the can was put into cold water after being heated, the sudden decrease in temperature caused the volume of gas decrease, so it sucked up some water to fill the space.

Then we looked into the relationship between pressure and volume. The graph above shows everything.

Then we looked into the relationship between the pressure and temperature.

We worked on this problem.

Solution to this problem was above.

We did a lab about pressure.

we evacuate the air inside the tank. we noticed the balloon gets bigger.

because the amount of air inside the balloon was constant. when the outside pressure decreases, air inside the balloon trys to go out to balance the pressure.