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An automobile engine works by opening a valve. Then a piston comes down creating a vacuum. That sucks a mixture of gasoline and air into the cylinder. Then the piston pushes up. Then a spark from a spark plug ignites the mixture. The mixture burns. The hot gasses push the piston down. Then the exhaust valve opens. The piston pushes the gasses out the exhaust. If you look under the hood of an automobile, you will see the engine. If you took the engine part way apart, you would see pistons and the cylinders they go in. On a piston engine each piston has a certain diameter. You can measure the diameter in centimeters. Then you can move the piston all the way to the bottom. Then you measure how far down it goes, again in centimeters. Then you divide the diameter by two to get the radius. You square the radius and multiply by pi. Then you multiply by the length of how far the piston travels. You multiply that by the number of cylinders. Now you have a large number. It is cubic centimeters. You can divide by 100 to change it to liters. So engine size means the total amount of air displaced by the pistons.
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