What is a micrometer?

Answer 1

There are 2 things that can be called a micrometer:

1/ A device for measuring short distances accurately. Typically to better than 1 thousands of an inch (thou) or 0.01mm. They look a bit like a small G clamp, something is placed between the jaws and it is lightly tightened, the thread has a gauge on it so you can see how big the thing between the jaws is.

2/ A very small distance, 1 millionth of a meter. Also written μm. (Or sometimes um.)

Additional Information

The above answer needs to be qualified. In fact, the above answer only applies to American English. In British English,

1. A micrometer is an instrument for measuring small thicknesses or diameters, as per answer 1, above.

2. The unit of measure is called a micrometre.

In other words, in British English, a meter is a measuring instrument, whereas a metre is a unit of measurement.

Answer 2

A micrometer is a precision instrument for measuring small distances, such as the thickness of metal sheets, diameter of conductors, etc.

In American English, it is also the spelling for one-millionth of a metre. In British English, this is spelt micrometre.

Answer 3

Micrometry is the making of measurements in microns (millionths of a meter).

Answer 4

an awkward way of saying nanometer (1x10-9 meters).

Answer 5

A micrometer, most likely. That's a millionth of a meter - or a thousandth of a millimiter. Also known as a micron.

Answer 6

It is a very accurate gauge used mainly for measuring wear on small machinery parts.

Answer 7

to measure the outside diameter

Answer 8

One millionth

Answer 9

no