WeatherballoonsandHyperbaricoxygenchambers

Weather Balloons Meteorologists use weather ballons to show the temperature, pressure, relative humidity, and wing velocity in the upper atmosphere. There are more then 700 sites where the balloons are released. They release them at the same time. They are filled with hydrogen or helium. When the atmospheric pressure decreases, the helium/hydrogen expands carrying the balloon higher. The balloon bursts and the radio trasmitter and measuring instruments fall safely to the ground. 1. I think they weren't obsolete because they get all the information from many places around the world and are recorded at the same time. 2. They need to understand the gas laws because it helps them figure out how to get the balloon to rise. If they didn't know they wouldn't be able to get the balloon to rise at the rate they want.

Hyperbaric Oxygen Chambers

They first used this machine in the 1940s for the Navy to cure decompression sickness, but found out that it can also heal bone and muscle injuries. Many football teams have used this to cure injuries at a lot faster rate. Abnormal oxygen flow causes blood vessels to constrict, which limits swelling. They have also used this when someone goes through a heart attack. It can help the pain subside quicker then just taking the medicine. Also it can help babies survive when they have hyaline-membrane disease. 1. It has a higher air pressure. 2. You can be placed in a sterile environment. Maybe you can get more oxygen to the dead skin. Also it will limit swelling.