BS EN 61197:1996, IEC 61197:1993

Liquid - A state of matter - fluid form

Glass - A solid, typically transparent. Brittle and used in windows. The first patent granted in the UK was for Glass.

Safety - prevents damage being caused.

Fire - the release of energy through heat and light.

Electrical - Something that requires electricity to work.

Equipment - A product or good that is tactile.

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