Mr. Russell’s Classroom: Time For A Science Lesson

 

It’s the 2nd day of Mr. Russell’s classroom. Today’s lesson was all about science and who better to teach us about this topic than J-Stace the Science Ace. Let’s get started!

J-Stace The Science Ace: Egg in a Bottle

Here’s an amazing way to get a hard-boiled egg into a bottle, even though the mouth of the bottle is smaller than the egg! What’s more, you don’t even need to touch the egg to get it to go in!

 

What You Need:

  • a hard-boiled egg
  • a glass bottle with a mouth just slightly smaller than the egg (a fruit-drink bottle works well)
  • a piece of paper
  • a match or lighter

 

Instructions

  1. Remove the shell from the egg.
  2. Set the egg on the mouth of the bottle to see that the egg does not fit through the mouth.
  3. Fold the piece of paper into a strip that can be dropped into the bottle
  4. Light the folded strip of paper.
  5. Remove the egg from the mouth of the bottle and drop the burning strip of paper into the bottle.
  6. Before the fire goes out, set the egg back onto the mouth of the bottle.
  7. Within a few seconds, the egg will squeeze through the mouth and into the bottle.

Science Behind the Experiment

Why does the egg slide into the bottle, even though no one is pushing it? Because the pressure of the air is pushing it.

Before the burning paper was put into the bottle, the pressure of the air inside the bottle was the same as outside the bottle. The burning paper, however, heats the air inside the bottle. This causes the air inside to expand. When the egg is placed on top of the bottle, it seals the bottle, and the fire eventually goes out. When the fire goes out, the air inside the bottle cools. As it cools, the air contracts and the pressure of the air inside the bottle becomes less than the pressure outside. Then, the higher outside pressure pushes the egg into the bottle!

 

Science Word of the Day

The Ideal Gas Law helps understand this phenomenon.

The law is partly based on this theory: if the temperature increases the pressure must also increase, and as the temperature decreases the pressure also decreases.

 

*Source

 

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