top of page
2.1 Measurement
Notes :
Name appropriate apparatus for the measurement of time temperature mass and volume .including burettes pipettes and measuring cylinders.
● Appropriate apparatus for measuring of
Time: stopwatch/clock
Temperature: thermometer
Mass: balance
Volume: measuring cylinder, burette, pipette
Temperature
-
Temperature is measured with a thermometer which can give readings to the nearest degree Celsius
-
Digital thermometers are more precise than regular thermometers
-
The units of temperature are degrees Celsius
.png)
Time
-
Time can be measured using a stopwatch accurate to one or two decimal places
-
The units of time are seconds or minutes
Mass
-
Mass is measured using a digital balance with readings to two decimal places.
-
Units of mass commonly used are kilograms (kg)
and grams (g)
Volume-liquids
The volume of a liquid can be determined using
several types of apparatus
according to the accuracy required.
-
For approximate volumes where accuracy is not an
important factor, measuring cylinders are used.
They are graduated (have a scale so can be used to
measure) and are available in 25 cm3, 50 cm3, 100 cm3
and 250 cm3
-
Pipettes are the most accurate way of measuring
a fixed
volume of liquid, usually 10 cm3 or 25 cm3
-
Burettes are the most accurate way of measuring a
variable
-
volume of liquid between 0 cm3 and 50 cm3
(e.g. in a titration)
.png)
.png)
.png)
Volume-gases
The volume of a gas measurement is done through
-
A gas syringe
-
A graduated cylinder inverted in water but the gas should not be water-soluble
-
In A gas cylinder but the position depends If the gas is heavier than air
-
the cylinder can be used upright or if lighter than air to be used downward
Measuring Cylinder
Pippettes
Burette
bottom of page