Physical Quantities
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what are some physical quantities?
mass, time, temperature and volume
what is the SI unit of mass?
kilogram (kg)
how can you measure mass?
• beam balance - electronic balance
what is the precision of using an electronic balance?
nearest 0.01g
what is the SI unit of time?
seconds (s)
what do you use to measure time?
stopwatch
what is the precision of using a stopwatch?
nearest 0.01s
what is the SI unit of temperature?
degree celcius
how can you measure temperature
• mercury or alcohol thermometer - data logger with temperature sensor
what is the precision of the mercury or alcohol thermometer?
nearest 0.5 degree celsius
what is the precision of the data logger with temperature sensor?
nearest 0.1 degree celsius
what is the SI unit of volume?
cubic metre
how can you measure volume?
• measuring cylinder • burette • pipette • gas syringe
what is the precision of a measuring cylinder?
nearest 1cm 3
what is burette used for measuring?
variable volumes
what is the precision of using a burette?
nearest 0.05cm 3
what is pipette used for measuring?
fixed volumes such as 20cm 3 and 25.0cm 3
what is gas syringe used in measuring?
gases