| PACO2 | partial pressure of carbon dioxide in alveolar gas |
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| RGC | radio-gas chromatography; remnant gastric cancer; retinal ganglion cell; right giant cell |
| RGE | relative gas expansion |
| SAO2 | oxygen saturation in alveolar gas |
| STPD | a volume of gas at standard temperature and pressure that contains no water vapor |
| hess's law | <chemistry> In going from a particular set of reactants to a particular set of products, the enthalpy change is the same whether the reaction takes place in one step or a series of steps, in other words, enthalpy is a state function. (09 Jan 1998) |
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| Schutz' law | The rate of an enzyme reaction is proportional to the square root of the enzyme concentration; applied specifically to pepsin within a limited range. Synonym: Schutz' law. (05 Mar 2000) |
| Proust's law | The relative weights of the several elements forming a chemical compound are invariable. Synonym: Proust's law. (05 Mar 2000) |
| Hilton's law | The nerve supplying a joint supplies also the muscles which move the joint and the skin covering the articular insertion of those muscles. (05 Mar 2000) |
| second law of thermodynamics | <physics> All of the chemical and physical processes in a closed system tend to drive that system toward maximum entropy. Clausius statement: No device can operate in a cycle and allow heat to transfer from a colder body to a hotter body unless other compensating activities are taking place. Kelvin-Planck statement: no device can operate in a constant-temperature cycle and convert the heat it receives into work, unless other other compensating activities are taking place. (09 Oct 1997) |
| Hooke's law | The stress applied to stretch or compress a body is proportional to the strain, or change in length thus produced, so long as the limit of elasticity of the body is not exceeded. (05 Mar 2000) |
| Semon's law | An obsolete law stating that injury to the recurrent laryngeal nerve results in paralysis of the abductor muscle of the vocal cords before paralysis of the adductor muscles. (05 Mar 2000) |
| Sherrington's law | Every dorsal spinal nerve root supplies a particular area of the skin, the dermatome, which is, however, invaded above and below by fibres from the adjacent spinal segments. (05 Mar 2000) |
| Snell's law | For two given media, the sine of the angle of incidence bears a constant relation to the sine of the angle of refraction. Synonym: Descartes' law, Snell's law. (05 Mar 2000) |
| Spallanzani's law | The younger the individual the greater is the regenerative power of its cells. (05 Mar 2000) |
| Nasse's law | An early statement of the pattern of X-linked recessive inheritance: haemophilia affects only boys but is transmitted through mothers and sisters. (05 Mar 2000) |
| Starling's law | The energy liberated by the heart when it contracts is a function of the length of its muscle fibres at the end of diastole. Synonym: Starling's law. (05 Mar 2000) |
| Stokes' law | A muscle lying above an inflamed mucous or serous membrane is frequently the seat of paralysis, a relationship of the rate of fall of a small sphere in a viscous fluid; applicable to centrifugation of macromolecules, the wavelength of light emitted by a fluorescent material is longer than that of the radiation used to excite the fluorescence. (05 Mar 2000) |
| Neumann's law | In compounds of analogous chemical constitution, the molecular heat, or the product of the specific heat by the atomic weight, is always the same. (05 Mar 2000) |
| Newton's law | The attractive force between any two bodies is proportional to the product of their masses, and inversely proportional to the square of the distance between their centres. Synonym: law of gravitation. (05 Mar 2000) |