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Lab_Manual_01

# Lab_Manual_01 - Lab 1 UNITS DIMENSIONS ERROR CALCULATION...

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Lab 1 UNITS, DIMENSIONS, ERROR CALCULATION, GRAPHING 1. UNITS In order that measurement may be meaningful to every body, units of measurements are standardized internationally. Such a system of units is called System Internationale (S.I). The following are some of the commonly used S.I units. Quantity measured Unit used abbreviation Length Meter M Mass Kilogram Kg Time Second s Electric Current Ampere A Temperature Kelvin K Length is measured using a meter ruler. For measuring small lengths or distances a meter is divided into smaller units such as the centimeter (cm), millimeter (mm), micrometer ( µ m), nanometer (nm), picometer (pm) etc. Long distances are measured in kilometers (km) 10 2 cm = 1 m 1 cm = 10 -2 m 10 3 mm = 1 m 1 mm = 10 -3 m 10 6 µ m = 1 m 1 µ m = 10 -6 m 10 9 nm = 1 m 1 nm = 10 -9 m 10 12 pm = 1 m 1 pm = 10 -12 m 1 km = 1000 m In a similar way a kilogram is divided into grams (g), milligram (mg), microgram ( µ g), nanogram (ng) and so on. There are different forms of laboratory scales that you may use to measure mass. The most popular is the electronic balance that you see along the side benches. Question: Make a table as above showing the relation between kilogram and its smaller units. 1 kg = ………….g 1 g =………….kg 1 kg =…………..mg 1 mg =………….kg 1 kg =………….. µ g 1 µ g =………….kg Temperature is measured using a thermometer. The thermometer used in the laboratory is marked in degree Celsius ( o C)

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