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# Lab report science

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### Lab report science

1. 1. PHYSICAL QUANTITIES AND MEASUREMENTS<br />Objective<br />To obtain derived quantity from base quantities<br />To ensure consistency, sensitivity and accuracy of instruments<br />Inference<br />Base quantities are the quantities that cannot be defined in terms of other quantities.<br />Derived quantities are physical quantities derived from the base quantities through multiplication, division or both.<br />Density of substance, ρ = mass = m <br />Volume v<br />Relative density, <br />Hypothesis <br />Measuring physical quantity precisely.<br />Differentiate between base and derived quantities.<br />Apparatus /Material<br />Wooden block, vernier calliper, beam balance, glass rod, ruler, metal block, measuring cylinder<br />Experiment 1a<br />Apparatus <br />Wooden block <br />Vernier calliper<br />Beam balance/ Electronic balance<br />Procedure<br />Measure the dimension of the wooden block by using vernier calliper.<br />Weigh the mass of the wooden block by using Beam balance / Electronic Balance.<br />Record all the data in the TABLE 1.0<br />Result <br />Dimension ReadingHeight, h3.85 cm3.85X10-2 mWidth, w6.62 cm6.62X10-2 mLength, l10.21 cm10.21X10-2 mMass, m236.1 g kgVolume, V cm3 m3Density, ρ g cm3 kg m3Relative Density, ρr<br />Experiment 1b<br />Apparatus <br />Glass rod<br />Micrometer screw gauge / vernier calliper<br />Beam balance / electronic balance<br />Ruler <br />Procedures<br />Measure the dimension of the glass by using Micrometer Screw Gauge or Vernier Calliper<br />Record all the data in TABLE 2.0.<br />Result <br />DimensionReadingDiameter, D cm mLength, l16 cm0.16 mMass, m 14.5 g mVolume, V cm3 m3Density, ρ g cm3 kg m3Relative Density, ρ r<br />Experiment 1c<br />Apparatus <br /><ul><li>Metal block / rod
2. 2. Micrometer screw gauge / vernier calliper
3. 3. Beam balance / electronic balance
4. 4. Measuring cylinder
5. 5. Scissor
6. 6. String</li></ul>Procedures<br /><ul><li>Measure the dimension of the metal by using micrometer screw gauge or vernier callipe.
7. 7. Record all the data in TABLE 3.0</li></ul>Result <br />Dimension ReadingAverageTrial 1Trial 2Diameter, D/ width, wLength, lMass, mExperiment Volume, VexpTheory volume, Vtheory - using formulaExperiment density, ρ expTheory density, ρ theory% error for density Relative density, ρ r<br />Questions<br />State the precautionary steps to avoid errors in the experiment .<br />Repeated reading are taken and the average value is calculated<br />Avoid parallax error<br />Avoid zero error<br />Use instruments which is not defective<br />Conclusions<br />The derived quantities can be calculated or expressed in terms of base quantities<br />Exercising greater care and effort when taking readings<br />Experiment 1a<br /> <br />Experiment 1b <br />Experiment 1c<br />485775240665<br />46672548260<br />