Machine Drawing

448 Machine Drawing

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d:\N-Design\Des23-1.pm5

Table 10 SI units

Sl. No. Physical quantity Name of SI Unit Symbol

BASIC SI UNITS

1. Length metre m


2. Mass kilogram kg


3. Time second s


4. Electric current ampere A


5. Thermodynamic temperature kelvin K


6. Luminous intensity candela cd

DERIVED SI UNITS

1. Frequency hertz Hz = 1 c/s


2. Force newton N = kg m/s^2


3. Work, energy, quantity of heat joule J = Nm


4. Power Watt W = J/s


5. Area square metre m^2


6. Volume cubic metre m^3


7. Density (mass density) kilogram per cubic metre kg/m^3


8. Velocity metre per second m/s


9. Angular velocity radian per second rad/s


10. Acceleration metre per second squared m/s^2


11. Angular Acceleration radian per second squared rad/s^2


12. Pressure (stress) newton per square metre N/m^2


13. Dynamic viscosity newton second per square metre Ns/m^2


14. Kinematic viscosity square metre per second m^2 /s


15. Entropy joule per kelvin J/K


16. Specific heat joule per kilogram kelvin J/kg K


17. Thermal conductivity watt per metre kelvin W/mK