Millimetre (mm)

A millimetre measures length that is equal to 1/10 of a centimetre. It also equals 0.04 inch. There are 25.4 millimetres in one inch.

Is it an emergency?

If you or someone in your care has chest pains, difficulty breathing, or severe bleeding, it could be a life-threatening emergency. Call 9-1-1 or the local emergency number immediately.
If you are concerned about a possible poisoning or exposure to a toxic substance, call Poison Control now at 1-800-567-8911.

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