compression wave front
11Sound — /sownd/, n. The, a strait between SW Sweden and Zealand, connecting the Kattegat and the Baltic. 87 mi. (140 km) long; 3 30 mi. (5 48 km) wide. Swedish and Danish, Oresund. * * * I Mechanical disturbance that propagates as a longitudinal wave… …
12impact crater — Astron., Geol. crater (def. 2). [1890 95] * * * ▪ landform Introduction any feature on the continents that has been created by the impact of cosmic bodies (meteorites, asteroids (asteroid), or comets (comet)) on the Earth s surface. In fact …
13Expansion chamber — An Expansion chamber is an exhaust system used on a two stroke cycle engine to enhance its power output by improving its volumetric efficiency. It makes use of the energy left in the burnt exhaust exiting the cylinder to aid the filling of the… …
14nuclear weapon — an explosive device whose destructive potential derives from the release of energy that accompanies the splitting or combining of atomic nuclei. [1945 50] * * * or atomic weapon or thermonuclear weapon Bomb or other warhead that derives its force …
15Valveless pulse jet — A Valveless pulse jet (or pulsejet) is one of the simplest jet propulsion devices ever designed, and is the simplest form of jet engine that does not require forward motion to run continuously. Valveless pulsejets are low in cost, light weight,… …
16fluid mechanics — an applied science dealing with the basic principles of gaseous and liquid matter. Cf. fluid dynamics. [1940 45] * * * Study of the effects of forces and energy on liquids and gases. One branch of the field, hydrostatics, deals with fluids at… …
17ONDES (physique) — Le concept d’onde est l’un des plus universels de la physique mathématique. Ce dernier, élaboré au XVIIe siècle, lorsque la division entre mathématiques et physique (et philosophie aussi) n’avait pas le caractère institutionnel que nous lui… …
18plasma — plasmatic /plaz mat ik/, plasmic, adj. /plaz meuh/, n. 1. Anat., Physiol. the liquid part of blood or lymph, as distinguished from the suspended elements. 2. Cell Biol. cytoplasm. 3. whey. 4. a green, faintly translucent chalcedony. 5. Physics. a …
19Shock tube — A shock tube is a device used primarily to study gas phase combustion reactions. Shock tubes (and related shock tunnels) can also be used to study aerodynamic flow under a wide range of temperatures and pressures that are difficult to obtain in… …
20High strain dynamic testing — is a method of testing deep foundations to obtain information about their capacity and integrity, and in some cases, to monitor their installation. It is codified by D4945 00 Standard Test Method for High Strain Dynamic Testing of Piles. High… …
