Convention for Writing Units and Their Symbols

Why is it important to have SI units that are used universally?

The symbol for the units are written in capital letter.

What are the rules to be followed in writing SI units and their symbols?

Write the symbol for the unit metre. ($\mathrm{m}/\mathrm{cm}$) 

Is it correct to write "$5 \mathrm{ms}$" to represent "$5 \mathrm{meters}$" in the plural form of units? Justify your answer.

What is the temperature in S.I. units? What is the conventional way to write the temperature in units? Describe.

A building is $67 \mathrm{m}$. high. Write this in $\mathrm{ft}$.

What is the unit of effort?

Choose the correct convention method in writing the unit of temperature.

Which convention regarding the use of SI units is correctly stated?