Length measurements
The metre ruler is a tool that we would use quite often in our school lives but it is only accurate to 0.1cm and you cannot make measurements that are less than 1 decimals place. You may think that reading a metre ruler is very simple but there is more than meets the eye. I learnt about parallax errors and this can happen when reading a metre ruler of reading the water level of a measuring cylinder. This is caused by the positioning of the eye and make affect your results hence it is very important that you know the right way of reading the metre ruler order to prevent such an error. Firstly, we have to position our eye vertical or perpendicular to the mark and for a measuring cylinder, the water level has to be at your eye level. Here is picture to illustrate
how.
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