Physical quantities and units

In this lesson I learnt about SI uints .I learnt about Si units of length, mass, time, and temperature.This lesson felt more like maths lesson than a science lesson as we learnt about conversion of SI units and prefixes.On another lesson, I learnt about use of measuring instrument. I learnt that a common mistake is the parallax error which is the wrong positioning of the eyes when we are reading a measurement. We measurement different things with a meter rule, vernier calipers and a micrometer screw gauge. I found out that the instrument with the most accurate reading is the screw gauge.