micrometer
/mai'krɔmitə/
Definition
- Noun:
- A precision measuring instrument: A micrometer is a device used for making very precise linear measurements, typically of small distances, thicknesses, or diameters. It functions as a type of caliper.
- A unit of length: A micrometer is a metric unit of length equal to one millionth (10⁻⁶) of a meter. It is also called a micron.
Usage and Examples
- Noun (Measuring Instrument):
- The machinist used a micrometer to check the thickness of the metal sheet.
- Accuracy to within a few micrometers is essential for this component.
- Noun (Unit of Length):
- A human hair is about 50 to 100 micrometers in diameter.
- The wavelength of infrared light is measured in micrometers.
Advanced Usage
- "Micrometer screw gauge": A common full name for the measuring instrument, emphasizing its screw mechanism for fine adjustment.
- For the most accurate reading, use a micrometer screw gauge.
- In scientific contexts, the unit "micrometer" is often synonymous with "micron," though "micrometer" is the preferred term in the International System of Units (SI).
Variants and Related Words
- Micrometery (n): The art or process of measuring with a micrometer.
- Micrometric (adj): Relating to measurement by micrometer or to very small scales.
- The adjustment required micrometric precision.
- Micron (n): Another term for the unit of length equal to one micrometer.
Synonyms
- Caliper (for the instrument): A device for measuring dimensions, though a micrometer is a specific, highly precise type.
- Micron (for the unit): A unit of length equal to one millionth of a meter.
Notes on Different Meanings
The two primary meanings are distinct but related through the concept of extreme smallness. The measuring instrument is named for its ability to measure on the scale of micrometers (the unit). Context always clarifies which meaning is intended: engineering/mechanical contexts typically refer to the tool, while physics, biology, and materials science often refer to the unit.
Noun
-
caliper for measuring small distances
-
a metric unit of length equal to one millionth of a meter
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