1. Time: symbol (s). Read as a second. It is small s . Writing 10 s and 10 Second is correct. Use of 10 Sec. or 10 SEC. Or 10 seconds is not correct.
2. Mass: symbol (kg). Read as Kilo Gram. It is small k and small g. Writing 25 kg or 25 Kilo Gram is correct. The use of 10 KG or10 KGM or 10 KGS is not correct.
3. Length: symbol (m). It is small m. Writing 20 m or 20 Metres is correct. Note the spellings Metre is for measurement of length and meter is used for some indicating devices. Writing 20 Mtrs. or 20 Mt. or MTRs is not correct.









































