I'd like to give a special thanks to Jacob for this week's question about how car engines work. You're listening to Sleep Tide Science. Did you know there are about one billion cars in the world today.

Hmm?

That's a lot of engines.

Wow!

So what is a car engine?

Have you ever thought about how a car engine? Have you ever thought about how a car takes you from one place to another?

Maybe you sit in your car to go to school,

a park, or even a friend's house.

Every car has an engine under the hood. An engine is a machine that uses many different parts

to change fuel into energy or power.

The engine creates enough power to make the car move.

The powerful internal combustion engine under the hood of your car is what makes this all happen.

The secret to the engine is simply burning gasoline.

Gasoline has molecules, which were made up of atoms of hydrogen and carbon.

When the gas is set on fire, it mixes with air.

This makes the gasoline grow, and one molecule of gasoline becomes many molecules.

This growth makes a large amount of heat and pressure. The pressure makes the

pistons that are attached to a crank shaft move up and down with great force. This up-and-down movement makes the wheels of the car go.

And then, you're on your way.

So, what are the parts of an engine? And how do they work? Just like we need food to keep us going,

most car engines need gasoline to work. If we look inside a car's engine, we can see round cylinder

shapes. Each one of these cylinders has many parts, such as pistons and spark plugs.

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