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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Temperature in Kelvin (K) = Temperature in o C + 273 An interval of one degree in the Celsius scale is the same as an interval of one Kelvin in the Kelvin scale. For this reason, for most of the experiments we do in the lab, temperatures measured in o C need not be converted to Kelvin as we will be working with temperature intervals in most cases. Very often, in order to solve problems, we need to convert measurements from one form of units to another in the same system. Question: Perform the following conversions: 1. 1.2 mm =……………. .cm 2. 1.2 mm =……………. .m 3. 17.6 cm =……………. .m 4. 356 g =……………. .kg 5. 586 mg =……………. .kg 6. 15 m =……………. .cm 7. 1.51 m =……………. .mm 8. 252 m =……………. .km 9. 500 km =……………. .m 10. 0.5 km =……………. .cm The units of length, mass, time, temperature and electric current are called FUNDAMENTAL UNITS . The units of a lot of other quantities that we measure in the lab are obtained by suitably combining these fundamental units. For example, the unit of area is m 2 , the unit of speed is meter per second (m.s -1 ) and so on. Such units are called DERIVED UNITS . Units are written in the scientific notation form. For example m/s is written as m s -1 .
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This note was uploaded on 05/01/2011 for the course PHY 2048 taught by Professor George during the Fall '10 term at Edison State College.

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

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