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What is the dimension of a plane angle?
The graduation of an angle would usually be expressed in degrees, of which there are 360 for a complete circle.
What is usually expressed as a fraction?
A rational number, other than an integer, is expressed as a fraction.
What is This is the linear extent in space from one point to another the longest horizontal dimension of something that is fixed in place expressed in linear units.?
The term you are describing is "length." Length is the measurement of the longest dimension of an object in space, typically from one point to another in a straight line. It is commonly expressed in linear units such as inches, feet, meters, or kilometers.
How do you find the precision of measurements?
To check the precision of an instrument its apparent measurement must be compared to a known measurement. The difference between the measured quantity divided by the known quantity is expressed as a % precision of the instrument, or calibration. Most instruments when being calibrated are tested against multiple known quantities throughout the range of the instrument. Thus the precision of the instrument is determined throughout it's full range of measurement.
How can you convert a temperature expressed in celsius to kelvins?
Add 273 to Celsius; for exact precision, add 273.15, but 273 is close enough for most all applications
