Half an inch equals exact 1.27 centimeters.
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One half of a gram is equal to 0.5 grams in the metric system.
Half a pint of milk is equivalent to approximately 284 milliliters in the metric system.
You would use millimetres.
Mercury is the smallest planet, so there isn't one with half the diameter.
No. Neither half a pound nor a pound have any place in the metric system. And they never did have a place either.