A gallon is certainly not metric. It is imperial.
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One US gallon = 3.7854118 liters - but then you have the "Imperial gallon" that is even "bigger" whereas a liter remains the same..
If you convert one metric ton of water to gallons, you would have 264.2 US gallons. This is equal to 220 UK gallons.
The standard converskion of imperial to metric is 1 inch = 2.54 cm. Hence 19 ins = 19 x 2.54 cm = 48.26 cm
NONE!!!! 'Metres' is a metric measure of LENGTH 'Square feet' is an Imperial measure of 'AREA'.
This is usually expressed as weight or force per square area. In imperial measure (USA) pounds per square inch In Metric KG/meter2