# What is meant by CC which is used for motorbikes?

CC or cubic centimeters refers to engine capacity. Specifically it refers to the amount of air/fuel mixture able to fit into the cylinders (where combustion occurs) at full expansion. 1 cc is equivalent to 1 gram of water aka 1 ml. An example: 250 cc engine means the cylinders with pistons at full expansion can hold a volume of 250 ml of air/fuel mixture prior to the combustion stroke....
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Ray Dart commented
Unfortunately it is not in the least bit correct though. The CC of an engine is the displacement volume (i.e the swept volume), and has nothing to do with the amount of air/fuel mixture able to fit into the cylinders. The later answer by Duane is correct. Note also that the maximum capacity is prior to the compression stroke, not the power stroke.
You can compute CC by the formula:  Volume of a cylinder = Pi x r^2 x length.  Pi = 3.14  r = radius (1/2 of cylinder diameter - bore)    ^2 = squared (r x r)  length = piston travel from bottom dead center to top dead center (bdc - tdc).  That gives you displacement for 1 cylinder.  Multiply that by # of cylinders.
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It means cubic centimeter in a car or a bike. Its a dimensional representation of engine cylinder volume. The actual cylinder volume where d combustion process takes place.

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Cubic Centimeters: It is a measurement of the volume between when the piston is at the very top and very bottom of it's travel inside the cylinder, multiplied by the number of cylinders.

Because it's a metric measurement, it can be easily converted to liters. 1000cc = 1 liter, so 2.4L=2400cc.

There is not that much correlation between engine displacement and ultimate engine power. Power is determined by such factors as engine rpm, valve area, valve control, volumetric efficiency, etc... A modern Japanese 600cc sport bike, for example, makes almost twice the horsepower of my 1600cc Harley.
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That is Cubic Centimeters(CC) s a commonly used unit of volume extending the derived SI-unit cubic metre, and corresponds to the volume of a cube measuring 1 cm × 1 cm × 1 cm. One cubic centimetre corresponds to a volume of 1⁄1000000 of a cubic metre, or 1⁄1000 of a litre, or one millilitre; thus, 1 cm3 ≡ 1 mL. The mass of one cubic centimetre of water at 3.98 °C (the temperature at which it attains its maximal density) is roughly equal to one gram.
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Cubic centimeter
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Cubic capacity
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