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# Particle Model Of Matter Definition

The Particle Model of Matter is the idea that all matter is made of particles too small to be seen. For example, they're tightly packed in solids.

Grades 3-5 VideoParticle Nature of Matter
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## Particle Nature of Matter

### Fun Facts

• Particles are 100,000 times smaller than the width of a human hair, too small to be seen even with a powerful microscope.
• A particle is the smallest possible unit of matter and acts differently in different states.
• Liquid nitrogen converts carbon dioxide gas particles to a solid by shrinking space between them.

### Why Do We Need To Know About Particle Model Of Matter

Learning about tiny parts of matter helps us understand why things act the way they do. This knowledge is key in many areas like chemistry, physics, engineering, and technology.

This helps us make better things like materials, medicines, and sports gear. It’s also important for space exploration and managing the climate. Scientists can come up with new ideas to make our lives better and to push science forward.

Why would a soccer ball that has been left out in the cold go flat?
A soccer ball that is filled with air can go flat when air particles in it take up less space. This can happen if you inflate the ball indoors but then play outside in cold weather.
What is the smallest possible unit of a type of matter called and about how big is it?
The smallest possible unit of matter is called a particle. Particles of matter are 100,000 times smaller than the width of a human hair. They cannot be seen, but we can detect them.
Why did 500 mL of water combined with 500 mL of alcohol add up to only 970 mL of total liquid? Use the particle model of matter to explain.
The liquid volume decreased because the water particles can fit into the spaces between the larger alcohol particles. This makes them take up less space (volume). To model this difficult concept, Dr. Jeff uses ping pong balls to represent large molecules and red beads to represent smaller particles that can fill the space between the ping pong balls.
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