| AVOGADROSLAW | The principle that equal volumes of all gases contain the same number of molecules at the same temperature and pressure (9,3) |
| AVOGADRO | Amedeo ___ (1776-1856), Italian physicist whose eponymous law states that equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules (8) |
| AVOGADROSHYPOTHESIS | Law that under the same conditions equal gas volumes have the same number of molecules |
| METAMER | Compound that contains the same number and type of atoms as other compounds but with a different distribution of radicals |
| RNA | Molecule at the center of the central dogma of biology |
| METHADONE | Gas contains the same drug (9) |
| QUAVERS | Musical notes that equal one eighth of a semibreve |
| QUARTS | Liquid units of measurement that equal two pints (6) |
| RIVAL | Equal volume is central to currency (5) |
| ISOTONE | One of a group of atoms having the same number of neutrons but a different number of protons |
| CAVEATEMPTOR | The principle that the buyer must bear the risk for the quality of goods purchased unless they are covered by the seller's warranty (6,6) |
| CHI | Only Greek letter with the same number of letters after it in the Greek alphabet as the letter with a very similar capital form has in the English alphabet |
| HYDROGEN | A colourless, odourless gas that has the lowest density of all gases (8) |
| ISOTOPES | Atoms with the same number of protons but different number of neutrons (8) |
| FOUR | Only number whose name in English has the same number of letters as its value (4) |
| AGEGROUP | Set of people who are around the same number of years old: 2 wds. |
| UTILITARIAN | What is a follower of the principle that human conduct should aim to produce the greatest happiness |
| YIN | In Chinese philosophy, the principle that represents the female qualities of darkness and cold (3) |
| FOLICACID | One of a group of molecules in the vitamin B complex; an essential nutrient of the human diet (5,4) |
| EVEN | Having the same number of points on the level |
