Handling of fuels and lubricants used when working with motor vehicle engines.

Schools have built and run small engine test beds to allow study of torque: speed characteristics and fuel consumption. These typically use a small lawn-mower engine but much smaller systems have used model aircraft engines.

Products generated by the combustion of fuels are mainly carbon dioxide and water together with traces of carbon monoxide, hydrocarbons, nitrogen oxides, sulfur oxides and organic lead compounds.

Using a powered mixer to mix mortar or concrete for use.