system and units
Download as PPTX, PDF2 likes2,792 views
This document discusses systems and units used in chemical engineering. It defines a system as a collection of equipment and operations with defined inputs and outputs. Units are used to quantify variables. It then describes common unit systems like SI, FPS, CGS, and MKS. The document outlines basic and derived SI units, unit prefixes, symbols for common units, recommended practical units, and conversion factors between units.
system and units
- 1. Chemical equipment's and design- System and units Azhaguvel.P
- 2. System and units • A system is some collection of equipment and operations, usually with a boundary, communicating with its environment by a set of input and output signals Ex: pressure vessel, pile line • units is used to quantifying the variables Ex: kelvin(k)
- 3. • Types: FPS- Feet (ft), Pound (lb), Seconds (sec), Fahrenheit (`F) CGS- Centimeter (cm), Gram (g), Seconds (sec), Celsius (`C) MKS- Meter (M), Kilogram (Kg), Seconds (sec), Celsius (`C) SI – Meter (M), Kilogram (Kg), Second (sec), Kelvin (K)
- 4. Basic SI Units: Physical quantity Name of SI unit symbol Length Meter m Mass Kilogram Kg Time Second s temperature Kelvin K
- 5. Derived SI units with special names: Physical quantity Name of SI unit symbol Frequency Hertz Hz= 1 c/s Force Newton N= Kg.m/s^2 Work, energy Joule J= Nm Power Watt W= J/s
- 6. Derived SI units with complex names: Physical quantity Name of SI unit symbol Area Square meter m^2 volume Cubic meter m^3 Density Kilogram per cubic meter Kg/m^3 Velocity Meter per second m/s Angular velocity Radian per second rad/s Acceleration Meter per second square m/s^2 Pressure (stress) Newton per square meter N/m^2 Dynamic viscosity Newton second per square meter N.s/m^2 Kinematic viscosity Square meter per second m^2/s Specific heat Joule per kilogram kelvin J/Kg.K Thermal conductivity Watt per meter kelvin W/m.K
- 7. Selection of decimal multiples and sub- multiplies of units: Factor to be multiply Prefix symbol 10^6 Mega M 10^3 kilo K 10^2 hector h 10^1 deca da 10^-1 deci di
- 8. Symbols for units: Physical quantity symbol SI unit Acceleration a m.s^-2 Acceleration of free fall g m.s^-2 area A m^2 diameter d m force F N
- 9. Recommended practical units: Quantity SI unit Other units volume m^3 Liter(lit) Milliliter(ml) time s Day(d) Hour(h) Minute(min)
- 10. Conversion factors: Quantity Existing unit SI unit Recommended practical units Length 1micro meter 1.00×10^-6 m 1μm 1 thou(mil) 2.54×10^-5 m 0.0254 mm 1 inch 2.54×10^-2 m 25.4 mm 1 ft 3.0480×10^-1 m 304.8 mm 1 yd 9.1449×10^-1 m 0.9144 m 1 mile 1.6093×10^3 m 1.6093 Km
- 11. Thank you