Standard Units (SI) are
* length - metre (m) * mass - gram (g) * time - second (s) * Electric current - Ampere (A) * Temperature - Kelvin (K) * Luminocity - Candela (cd) * amount of a substance - mole (mol)
Plus any multiple of these, e.g. km, mm, kg etc.
Therefore non-standard units are anything other than these, for example length (feet), mass (punds), time (hours) etc
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Non-standard units are units of measurement that are not part of the standard system, such as inches, feet, or pounds. These units are typically used in a specific context or for a certain purpose and may vary depending on who is using them.
Standard units are more commonly used than non standard units. Also, many of the conversion factors, such as the Universal Gravitational Constant or the Speed of Light, are in standard units and, if your measurements were not in appropriate units, you would need to convert.
It is the International Standard of units.
Standard units are common units that can be re-measured easily. Examples: meters, miles, grams, seconds, etc. Non standard units are more so things than units that can't be measured as easily. Example: 13 pieces of gum in length. Surely you could lay out 13 pieces of gum, but gum varies in size which makes it more difficult to use as an accurate measurement.
The International System of Units has standard units for all types of measurements.Unfortunately some countries as United States, Canada, United Kingdom and colonies doesn't recognize the SI.
The standard unit that is the same in all systems of units is the second, which is the base unit for measuring time.