making measurements

• what are physical quantities

  the quantities that can be measured are called physical quantities
• what are the 2 types of physical quantities


  fundamental quantities

  derived quantities
• what are fundamental quantities


  fundamental quantities are those quantities that are distinct in nature and cannot be expressed in the form of other quantities
• what are derived quantities


  derived quantities are the physical quantities that that are defined and calculated in terms of fundamental quantities
• what is measurement


  measurement is the process of comparing and expressing an unknown quantity with a known quantity
• what are the 2 types that measurements are divided into


  unit of measurement

  magnitude
• what are SI units


  the units used by the standard system are called SI units
• what is volume


  volume is the measure of the space occupied by a substance
• what are the 2 types that volume can be measured in


  direct method

  indirect method
• what is one oscillation


  one oscillation is the motion of a pendulum starting from one extreme end to another extreme end and back to the first extreme end
• what is time period


  time taken to compete one oscillation by the pendulum is called time period
• what is temperature


  temperature is the degree of hotness or coldness of an object
• what are the commonly used thermometer

  laboratory thermometer

  clinical thermometer

  bimetallic thermometer
• what is mass 


  mass is the amount of matter contained in an object
• what is the SI unit for mass


  the SI unit for mass is kilogram<donated by KG>
• what is accuracy


  accuracy means how close the measured reading is with the true value of the quantity
• what is reliability


  reliability means how consistent the readings are every time the activity is carried out