Schools are increasingly promoting an inclusive agenda. As a result, science and D&T departments may find students who use medical oxygen are following a normal school curriculum and are in their classes.

The removal of grease and dirt with soaps, detergent powders and liquids. Stain removal by treatment of the whole garment or just the stained area with solvents, bleaches and enzymes.

The combustion of any fuel, eg, acetylene, propane or methane, with oxygen from a cylinder rather than air at normal or increased pressure, gives a hotter flame that is often easier to control.

This guidance is for choosing batteries for general practical circuit work, where pupils experiment with low-voltage circuits by connecting batteries , torch bulbs, buzzers, small motors and other low-power components to investigate electrical characteristics, parallel and series circuits, etc.