If you are in the USA, certain parts have even legislated the PI value (re: Indiana Pi Bill). Not only one must abide to the physical laws, there is also legislation!

Now, as others said, it's the ratios that matter. But you will need to order some chlorine in litres...

In reply to Re^2: Cubic inch to litre calculations by bliako
in thread Cubic inch to litre calculations by stevieb

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