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Determining Density

Determining Density. In order to be able to determine densities we should learn:. Units Measurement of Length Measurement of Volume Measuring Mass and Weight. Units. SI Units

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Determining Density

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  1. Determining Density

  2. In order to be able to determine densities we should learn: • Units • Measurement of Length • Measurement of Volume • Measuring Mass and Weight

  3. Units • SI Units • The following table gives SIunits for the basic physical quantities (things that can be measured). All scientists throughout the world use these units. (SI from the French “Le Systeme International d'Unites”.)

  4. Physical Quantity cal SSI Unit nit Symbol m Mass second A Temperature Kelvin Amount of substance Mole mol Luminous intensity Candela cd SI Units metre Length kilogram kg s Time ampere Electric Current K

  5. Units • Prefixes • Used to express physical quantities that are very big or very small. • Although metres are the SI unit for length we use other units based on the metre. Small objects will be measured in centimetres millimetres or micrometres. Large objects will be measured in kilometres.

  6. Prefix Meaning Symbol Micro ¸ 1,000,000 m Milli ¸ 1,000 m Centi ¸ 100 c Deci ¸ 10 d Kilo 1,000 k Mega 1,000,000 M Prefixes

  7. Units conversions • Express 5600 m/s in units of km/h

  8. …. and a tricky one!

  9. 30 40 15 20 35 10 Reading measuring cylinders PrecautionsAlways take the following precautions when reading the volume of a liquid: 1. Place the container on a flat horizontal surface. 2. The eye must be positioned perpendicularly at the mark of the scale. This is to avoid errors in measurement due to parallax. Q. What are the readings on the following measuring cylinders? (Scales in cm³.)

  10. 2 cm 3 cm Measuring Densities: Direct Method Regular Solids Volumes can be calculated by taking measurements then using formulae. Volume of rectangular block = Volume of cylinder =

  11. Measuring densities: Archimedes wayor the high-way Irregular Solids 2. Volume of a small irregular solid that floats Irregular Solids 1.Volume of a small irregular solid that sinks

  12. Measuring densities: Archimedes way or the high-way Irregular Solids 3. Volume of a larger irregular solid

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