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Download this page as a PDF file (also includes information on more complex tables)

 

Degrees of precision

  • Apply a simple rule. The degree of precision is equal to the smallest graduation on the instrument.

  • You may need to estimate the degree of precision sometimes especially with stop watches. Digital stop watches are said to be accurate to 0.01s but your reaction time is only 0.1s.

  • For electronic probes you may have to go to the manufacturers specifications (on their web site or in the instructions manual.

  • Some instruments have not degrees of precision because their reading is relative.

 

 

 

 

DRAWING TABLES

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Tables are a convenient way of recording data. Nevertheless they do follow certain conventions.

 

The results of an investigation on the effect of light on the cyclosis of chloroplasts

 

Table 1

 

Tables can be arranged horizontally too, to save space

 

The result of pig red blood cells exposed to different salt concentrations

 

Salt concentration / %

0

0.1

0.3

0.5

0.7

0.9

2.0

10.0

Colorimeter reading
/ % transmission

2

25

25

25

50

55

62

42

 

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