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.
4. Temperature: symbol (K). Read as Kelvin. It is capital K. Kelvin is a base unit. Temperature’s popular conventional units for daily use are Degree Celsius and Degree Fahrenheit. Writing a temperature of 340 K or 240 Kelvin is correct. 240 °C and 240 °F (small symbol of degree ‘°’ appeared before C and F but not a symbol of degree is used when presented the temperature in Kelvin).
Note: 240 K and 240 °C and 240 °F are not the same values. There are certain conversion formulae for finding equivalent temperatures given on one scale to the others.
5. Current: symbol (A). Read as Ampere. It is capital A. Ampere is used for both alternate and direct current measurements. Writing 10 A or 10 Ampere is correct. 10 Amp. and 10 Amps. is not correct.
6. Volt: symbol (V). Read as Volt. It is capital V. 220 V or 220 Volt is correct.
220 Vol. or 220 v is not correct.
