Science

Elements found in normal human body.

1. Oxygen  - 65.0 %
2. Carbon  - 18.0 %
3. Hydrogen - 10.0 %
4. Nitrogen - 3.0 %
5. Calcium - 2.0 %
6. phosphrous - 1.1 %
7. potassium - 0.35 %
8. sulpher - 0.25 %
9. sodium - 0.15 %
10. chlorine - 0.15 %
11. magnesium - 0.05 %
12. iron - 0.004 %
13. manganese - 0.00013 %
14. copper - 0.00014 %
15. cobalt - 0.00000016 %

Some basic points in science

• Lowest melting point : -38.8°C (-38° F)
• Highest melting point : 3652° C (6006° F)
• Rarest elements : Rhodium ( 3 tones mined every year )
• Heaviest metal : cube of osmium weighs 640 kgs

Scientific Instruments

• Altimeter : It is special type of aneroid barometer, used in measuring altitudes.
• Ammeter : used to measure strength of electric current.
• Anemometer : used to measure velocity and find direction of wind.
• Audiometer : used to measure difference in hearing.
• Barometer : used for measuring atmospheric pressure.
• Calorimeter : used for measuring qauntities of heat.
• Chronometer : It is clock to determine longitude of vessel at sea.
• Clinical thermometer : It is thermometer for measuring temperature of human body.
• Colorimeter : used for compairung intensities of colour.
• Commutator : used to change or reverse the direction of current.
• Dynamo : used to convert mechanical energy into electrical energy.
• Dynamometer : used for measure electrical power.

Material science 

1.  Brass - 

• Alloy of copper and zinc  (Alloy definition - Alloy is metal made by two or more metallic elements, to give more strength and corrosive resistance  )
• Density - 8.553 g/cm³
• brass is used to make pipes and tubes, weather-stripping and other architectural trim pieces, screws, radiators, musical instruments, and cartridge casings for firearms