Is Air There ??? ; Lab

Air pressure is an intricate subject. It deals with high and low pressure. I have just completed an "Is Air There" type of lab that includes a jar, small plastic bag, and a rubber band. The shows 2 different levels of air pressure; high and low. The first step was to secure the bag around the wide mouth part of the jar then tying the rubber band around it, thus securing it in place. Step 2, I had to push the bag into the jar with a little bit of pressure from my finger tips. This was definitely easy, but I also noticed the reason for why this simple task was so easy. This is because air pressure is higher outside the jar when I tried to push the bag into the jar. Subsequently, I took apart the model. After putting it back together, I was now supposed to complete another task: seemingly the opposite of the previous one. Step 4 was about trying pulling the bag out from the mouth of the jar. Unexpectedly, this was actually difficult because of the air pressure. The air pressure is higher inside the jar when trying to pull the bag out of the jar with my fingertips. This is an excellent example portraying the vacuum effect. This lab,"Is air there?" is definitely a magnificent way to demonstrate high and low air pressure that exists in our world. I hope that you have learned some details about air pressure. See you next time!!!