| AVOGADRO | ____'s law: With equal temperature and pressure, equal volumes of two gases contain equal numbers of molecules |
| AVOGADROSLAW | The principle that equal volumes of all gases contain the same number of molecules at the same temperature and pressure (9,3) |
| ISOTOPE | Each of two or more forms of a chemical element whose nuclei contain equal numbers of protons but different numbers of neutrons (7) |
| CLARIONS | Some brass, two gases and particles (8) |
| THEORY | Tentative insight as to why crack is filled with two gases (6) |
| KOHINOOR | Piece turned to compress two gases in forming diamond (3-1-4) |
| RIVAL | Equal volume is central to currency (5) |
| PLASMA | Hot ionized material of which all stars are composed, made up of roughly equal numbers of positive ions and free electrons; sometimes regarded as the fourth state of matter (6) |
| EVENPAR | What golfers with equal numbers of squares and circles on their scorecards shoot |
| LOGIC | Systematic way of reaching the wrong conclusion with confidence, in a version of Murphy’s Law |
| ATMOSPHERE | Unit of pressure equal to that exerted by a 760 mm column of mercury at 0degreesC and standard gravity, equivalent to 1013.25 millibars (10) |
| SWEETPEA | Minimal temperature and pressure in main plant (5,3) |
| HEAT | Elevated temperature and pressure (4) |
| PASCAL | SI unit of pressure, equal to one newton applied to an area of one square metre (6) |
| TIEVOTE | Equal number of ayes and nays |
| DRAW | Finish a game with an equal number of points, goals, etc. (4) |
| GUINEAS | Equal number of pounds and shillings for a race (7) |
| ISOCRYME | Contour line of equal temperature during the coldest period of a year (8) |
| KILOBAR | Unit of pressure equal to approximately 14,500 pounds per square inch or 100 megapascals (7) |
| HOOKE | ---'s Law, physical principle governing the extension and compression of springs (5) |
