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Percentage error = Value experimental-Value acceptedValueaccepted x 100
It depends on the type of ruler you are using. Depends if you are using a just metric unit ruler or if you are using a yard/meter stick. The measurements should be written along the edge of the ruler.
Make sure you are using the correct SI unit on the ruler.
a ruler using centimetres as the mesurement
The standard error is calculated by dividing the actual volume by the experimental volume. This is a common technique used in the laboratory.