{"id":55322,"date":"2025-11-02T06:47:46","date_gmt":"2025-11-01T21:47:46","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=55322"},"modified":"2025-11-02T06:47:46","modified_gmt":"2025-11-01T21:47:46","slug":"making-the-invisible-visible-discover-the-secrets-of-air-pressure-with-a-vacuum-chamber-using-a-bread-case","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=55322&lang=en","title":{"rendered":"Making the Invisible Visible! Discover the Secrets of Air Pressure with a Vacuum Chamber (Using a Bread Case!)"},"content":{"rendered":"

I’m Ken Kuwako, a Science Trainer. Every day is an experiment.<\/strong><\/span><\/p>\n

Have you ever heard the story about a bag of potato chips puffing up and almost bursting when you take it up a high mountain? This phenomenon is actually the work of “the power of air (Atmospheric Pressure)”, a force we completely ignore in our daily lives.<\/p>\n

Just as fish don’t feel the weight of water, we live without noticing the pressure of the air around us. But this force is definitely real. Today, I’m going to introduce an exciting experiment that visualizes this “invisible force” and uncovers why snack bags inflate on mountaintops.<\/p>\n

Recreate a “High-Altitude Location” Right Here on the Ground!<\/h3>\n

My colleague, Mr. K, taught me this ingenious method. The device we used is, surprisingly, a household “vacuum bread case<\/a>.” While it’s originally designed to protect bread from moisture, it’s actually a perfect, readily available tool for a science experiment. I even found it on Amazon<\/a>.<\/p>\n

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Vacuum Bread Case<\/a><\/p>\n

Using this container and a pump, we draw the air out to create a “thin air condition (low atmospheric pressure).” This artificially simulates a high-altitude environment, or perhaps even a condition close to outer space!<\/p>\n

Let’s See the Invisible “Weight of Air”<\/h3>\n

First, we put an “aneroid barometer” inside the case and used the pump to remove the air.<\/p>\n

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Aneroid Barometer<\/p>\n

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Atmospheric pressure literally means “the pressure of air.” It is the constant force pushing down on us, caused by the weight of the “column of air” extending from above our heads all the way up to the edge of outer space.<\/p>\n

When we started the experiment and began removing the air from the case… the barometer’s needle started rapidly dropping!<\/p>\n