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Q: Why micrometer is a commonly used unit of surface roughness?
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What is the unit of surface finish commonly used?

According to "ASME Y14.36M-1996 Surface Texture Symbols" (only since I don't have a copy of the better reference, "ASME B46.1-2009 Surface Texture" handy), surface roughness (commonly called "surface finish" or "surface texture") is specified and measured either in micrometers (or microns) or microinches depending on the primary dimensional units of the drawing (which are typically specified in millimeters or inches). You may also see surface finish listed as "Ra" for average roughness. A micrometer (or micron) is one millionth (1/1,000,000) of a meter, and a microinch is one millionth of an inch. A value of 3.2 micrometers is considered equivalent to 125 microinches. More precisely, 1 microinch equals 0.0254 micrometers, or 1 micrometer equals 10.07874 microinches. Some examples, of typical roughness (or surface finish) values in microinches, with micrometer equivalents in brackets [], are 125 [3.2] (typical for milled or drilled surfaces), 63 [1.6] (typical for turned or reamed surfaces), 32 [0.80] (typical for ground surfaces), 16 [0.40] (typical for honed surfaces), or 8 [0.20] (typical for polished surfaces). All common average roughness (Ra) specifications, from roughest to smoothest, are listed below. 2000 [50] 1000 [25] 500 [12.5] 250 [6.3] 125 [3.2] 63 [1.6] 32 [0.80] 16 [0.40] 8 [0.20] 4 [0.10] 2 [0.05] 1 [0.025] .5 [0.012]


What the unit µM means?

It is a micrometer, also called micron. It is 1 millionth of a meter. I hyphenated micrometer to differentiate the unit of measure from the measuring instrument.


Is a square micrometer a valid unit of measurement for volume?

No. You can take any unit of length to the third power (cube), but not to the second power (square), to get a volume. A square micrometer would be a unit of area.


What unit of length is 1000 000 the length of a meter?

Micrometer.


How long is a micrometre?

A micrometer is commonly known as a micron. It is an SI derived unit of length, which is equal to one millionth of a meter.

Related questions

What is the unit of surface finish commonly used?

According to "ASME Y14.36M-1996 Surface Texture Symbols" (only since I don't have a copy of the better reference, "ASME B46.1-2009 Surface Texture" handy), surface roughness (commonly called "surface finish" or "surface texture") is specified and measured either in micrometers (or microns) or microinches depending on the primary dimensional units of the drawing (which are typically specified in millimeters or inches). You may also see surface finish listed as "Ra" for average roughness. A micrometer (or micron) is one millionth (1/1,000,000) of a meter, and a microinch is one millionth of an inch. A value of 3.2 micrometers is considered equivalent to 125 microinches. More precisely, 1 microinch equals 0.0254 micrometers, or 1 micrometer equals 10.07874 microinches. Some examples, of typical roughness (or surface finish) values in microinches, with micrometer equivalents in brackets [], are 125 [3.2] (typical for milled or drilled surfaces), 63 [1.6] (typical for turned or reamed surfaces), 32 [0.80] (typical for ground surfaces), 16 [0.40] (typical for honed surfaces), or 8 [0.20] (typical for polished surfaces). All common average roughness (Ra) specifications, from roughest to smoothest, are listed below. 2000 [50] 1000 [25] 500 [12.5] 250 [6.3] 125 [3.2] 63 [1.6] 32 [0.80] 16 [0.40] 8 [0.20] 4 [0.10] 2 [0.05] 1 [0.025] .5 [0.012]


Are micrometer's a bigger or smaller unit than millimeters?

1 micrometer = 0.001 millimeters


What the unit µM means?

It is a micrometer, also called micron. It is 1 millionth of a meter. I hyphenated micrometer to differentiate the unit of measure from the measuring instrument.


Is a square micrometer a valid unit of measurement for volume?

No. You can take any unit of length to the third power (cube), but not to the second power (square), to get a volume. A square micrometer would be a unit of area.


What unit of measurement is smaller than millimetres?

a micrometer


What is the least count of the micrometer in inch unit?

0.00001"


What is the unit of measurement of paper?

Microns, this is measured with a micrometer


How many centimeters are there in 1 micrometer?

By unit of length and distance and conversion ,we can say that 1 cm=10000 micrometer


How many mm equal to one micrometer?

1 micrometer = 0.001 millimeters. Google can be used for unit conversions.


What unit of length is 1000 000 the length of a meter?

Micrometer.


Is millimeter the shortest unit of measurement?

nope you have a micrometer and a nanometer


Is micrometer a derived unit?

Yes, the definition of a derived unit is a combination of other units. Therefore, the following is not a single unit.AnswerNo. A micrometre is a submultiple (one-millionth) of a base unit: the metre.