When to use symbols for units of measurement?

Use symbols for units that are derived from time measurements, such as speed. The speed limit for urban areas in NSW is 50 km/h. People will read the number and its unit as a measurement only if the two components sit together. To do this, use a non-breaking space between numbers and their units of measurement.
For More Information Please Refer:
https://www.stylemanual.gov.au/style-rules-and-conventions/numbers-and-measurements/measurement-and-units
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