Justin+F,+Coleman,+Alon

__**//The Pressure Tester//**__


 * What data did your group record? Include temperature and pressure values using correct SI units**

At room temperature, the bottle had a pressure of 99kPa. When it was put into an 42.0 degrees Celsius bath of warm water, its pressure rose to 112kPa. When it was put into a 2.4 degrees Celsius bath of cold water, its pressure dropped to 97kPa.
 * || Temperature (degrees Celsius) || Pressure (kPa) ||
 * Room || 22 || 99 ||
 * Warm Water || 42 || 112 ||
 * Cold Water || 2.4 || 97 ||

 **What observations did your group make? What did the bottle look like and feel like?**

In the bath of cold water the bottle was loose. It had a very low pressure and drooped down upon impact. It formed cracks and dents in the bottle and collapsed in on itself in some places. It was squishy and very easy to squeeze. In the bath of warm water, the bottle became fuller and suddenly filled with more pressure. It was bulging out and very tight. There were no dents or cracks in the bottle as there were with the cold water, and it was fully inflated. It was hard to the touch and difficult to push in on itself.


 * What conclusions can your group make? Please explain why the bottle did what it did in the two different baths.**

The bottle was very loose on the cold water because the atoms in the cold water moved very slowly. The cold temperature is what slowed these particles down.These atoms did not bounce off the walls of the bottle at high speeds, so they did not have much energy. Without the energy, they were very slow and relaxed, making the bottle very loose. The bottle was very tight and firm in the warm water because the atoms in the bottle were fast. The hot temperature sped up the particles, causing them to bounce off of the walls of the bottle at quick speeds. With this high energy, a higher pressure was caused, inflating the bottle outwards. This made the bottle tight.

__//**The Leaky Can **//__


 * What data did your group record? Include temperature and relative humidity values using correct SI units**

Temperature of outside air: 10.6 degrees Celsius Temperature of inside water: began at 25.8 degrees Celsius, and dropped to 24.6 degrees Celsius Relative humidity: 106%


 * What observations did your group make? What did the metal can look like and feel like both before and after?**

Set up: The can that was used was a two-layered, cyllindrical-shaped can. It had a silvery, metal, gleaming outside and a dark, black inner cylinder. The can was half-way filled with ice water while there was a pot of boiling water set up nearby. We dyed the water in the can green to prove that it stayed in the container at all times and did not leak out.

Experiment: Once we filled the can half-way with dyed ice water, the outside of the can began to fog up with clear water. The outside lost its shine and became dull and wet. Pretty quickly, the entire outside of the can became fogged up and the water on the inside became a little warmer.


 * What conclusions can your group make? Please explain why the metal can did what it did. Please be very descriptive in your explanation.**

The water in the can was much colder than the temperature of the room. So, as the evaporated water vapor from the boiling water made contact with the cold can, it instantly cooled down and, through condensation, turned back into water. This happened because the water vapor in the air was a lot hotter and had faster-moving particles than the ice-water filled can, so when it made contact with the can, the particles slowed down and turned the gas into a liquid through condensation. The particles lost energy which caused it go through an exothermic change. We can prove that the water was from condensation, and not from the can leaking, because the water in the can was dyed green, while the water clinging to the outside of the can is normal, clear water. That is how this experiment worked and the physics behind it.