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Working in the Laboratory Index

The Bunsen Burner
How to work in a laboratory :Laboratory Rules
Laboratory Rules Quiz (opens in a new tab or window)
Question about Scientific Apparatus (opens in a new tab or window)

Biology Practical Work index

 

The Measuring Cylinder

Measuring cylinders are used to measure volumes accurately.

Measuring cylinder

Because scientists use them to measure small and large volumes, measuring cylinders come in different sizes.

Which cylinder

It is important to chose the correct measuring cylinder for the volume you wish to measure.

Which one?

It is also important to take a careful look at the graduation scale on the measuring cylinder before you use it. Make sure that you know which volume is represented by the distance between two adjacent graduation marks.

Using a Measuring Cylinder

Always leave the measuring cylinder on a flat surface when you are reading the volume of the liquid it contains. You should move your body downwards so that your eye is on the same horizontal line as the surface of the liquid.

Correct

   

 

Correct

DO NOT lift the measuring cylinder to measure the volume of the liquid contained in it!

Incorrect

 

The Filter Funnel

Filter funnel

Filter funnel drawing

The Pestle and Mortar

Note that the mortar is the dish and the pestle is the baton used for grinding.

Pestle and mortar

 

 

WORKING IN THE LABORATORY

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Scientific Apparatus

Scientists use special apparatus when they work in the laboratory. They often draw diagrams of the apparatus they use. These diagrams represent the apparatus in two dimensions and as a cut through image.

 

The Beaker

Beaker  Beaker drawing 

 

Beakers are used to hold liquids. They cannot measure liquids accurately but they do have graduations which allow you to estimate the volume of liquid. Some beakers, those made of heat resistant glass such as Pyrex, can be heated.

 

Beaker 2

 

Beakers come in different sizes. The maximum volume of liquid that can be held in a beaker is always written on its side.

 

The Test Tube

test tubes 

 

Test tubes are also used to hold liquids. Heat resistant test tubes can be heated.

test tube drawing

When you draw test tubes you do not show the test tube rack. It is assumed that the test tubes are being supported by the rack.

 

The Conical Flask

Conical flask 

conical flask drawing

The conical flask has the same properties as a beaker but it has a different shape. Because its neck is narrow a delivery tube can be fitted into it.

Conical flask with delivery tube 

This means that gases which evaporate when a liquid is heated can be 'directed' to another part of the apparatus.

 

The Evaporating Basin

Evapourating basin 

Evapourating dish drawing 

 

The Crystallizing Dish

Crystalising dish

 

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