In science, there are thousands of ways to measure the world around us that the average person may never encounter. For example: Pascals to measure pressure, Candles to measure light intensity, and ...

\({\%~of~an~element} = \frac{mass~of~an~element~in~the~compound}{relative~formula~mass~M_r} \times 100\) There are six atoms of hydrogen in the compound, so the mass ...

Units for measuring such as metres, kilograms and litres are covered in Metric Units and are examples of single units. Compound units at M1 covers speed, heart rate and fuel economy. Density is a ...