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from Brown Corpus
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The amount of liquid poured into the chamber is determined by subtracting the quantity still in the beaker when the chamber is full from the original quantity.
Most beakers are graduated in cubic centimeters ( cc. ), making it necessary to convert the result to cubic inches.
However, the displacement of the cylinder can be converted to cubic centimeters.
The compression ratio arrived at with the formula will be the same regardless of whether cubic inches or cubic centimeters are used.
The only precaution is that all volumes used in the formula be quoted in the same terms.

2.237 seconds.