Intended for healthcare professionals

Fillers A dilemma

A half mixed compound?

BMJ 1999; 318 doi: (Published 13 February 1999) Cite this as: BMJ 1999;318:435
  1. David Dean, medical science student
  1. Leeds

    Some lessons learnt during high school chemistry remain with me, none more so than the distinction between a mixture and a compound:

    Mixture: a substance consisting of two or more substances mixed together without any chemical bonding between them.

    Compound: a substance that contains atoms of two or more chemical elements held together by chemical bonds.

    As a teenager I did not object to being termed “half caste.” For the past few years I have preferred, and asked others to use, …

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