Monday, 8 June 2015

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Measurements and Instruments

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Measurements and Instruments



Units of Measurement

Physical Quantity
Unit of Measurement
Pressure
Pascal
Force
Newton and Dyne
Heat
Calorie
Relative loudness of sound
Decibel
Current
Ampere
Potential difference
Volts
Power
Watt, Erg, Horse Power


 

Scientific Principle: Applications/Visible effects

Application/Visible Effect
Scientific Principle
Hydraulic Brakes
Pascal’s law
Sky appears blue
Refraction
Global warming
Greenhouse effect
Theory of flight
Bernoulli’s theorem
Rainbow appears
Dispersion of light
Mirages are formed
(Refraction) Total Internal Reflection
Recoil of a gun
Newton’s third law of motion
Ship stays afloat
Archimedes principle
Food cooks faster in a pressure cooker
Boiling point of a liquid increases with increase in pressure




Instruments and their uses.
Instrument
    Use
Bolometer
Instrument for measuring radiation by means of the rise in temperature.
Hydrometer
Instrument for measuring the density of liquids.
Hygrometer
Instrument for measuring the humidity of the air or a gas
Lactometer
Instrument for measuring the amount of water in milk
Anemometer
Instrument for measuring wind force.
Salinometer
Instrument for measuring the salinity of a solution
Altimeter
Instrument for measuring the altitude of an aircraft etc.
Galvanometer
Instrument for detecting and measuring electric currents
Scopes

Telescope
Optical instrument using lenses or mirrors to magnify distant objects.
Microscope
Instrument with lenses for magnifying objects or details invisible to the naked eye.
Stethoscope
Instrument used in listening to the heart, lungs, etc. [Greek stethos breast]
Kaleidoscope
Tube containing mirrors and pieces of coloured glass etc. producing changing reflected patterns when shaken.
Endoscope
Instrument used to examine the interior of a hollow organ or cavity of the body
Oscilloscope
Device for viewing oscillations by a display on the screen of a cathode-ray tube.
Periscope
Apparatus with a tube and mirrors, by which an observer in a trench, submerged submarine, or at the back of a crowd etc., can see things otherwise out of sight
Graphs

Crescograph
Instrument for measuring growth in plants
Seismograph
Instrument that records the force, direction, etc., of earthquakes.
Cardiograph
Instrument recording heart movements.
Heliograph
Signalling apparatus reflecting sunlight in flashes.
Radiograph
Instrument recording the intensity of radiation


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