SonarAcoustic sensing methodFrench F70 type frigates (here, La Motte-Picquet) are fitted with variable depth sonar (VDS) type DUBV43 or DUBV43C towed sonars.A sonar image of the Soviet Navy minesweeper T-297, formerly the Latvian Virsaitis, which was shipwrecked in December 1941 in the Gulf of Finland.Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances (ranging), communicate with or detect objects on or under the surface of the water, such as other vessels.
Passive acousticsPassive acoustics is the action of listening for sounds, often at specific frequencies or for purposes of specific analyses. It is often used for passive acoustic monitoring(PAM), the act of recording animal and environmental sounds through the use of acoustic sensors for the purpose of tracking animals and answering other ecological questions.
Echo soundingEcho sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water (bathymetry). It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight, along with knowledge of the speed of sound in water, allows determining the distance between sonar and target.
Mechanical waveIn classical mechanics, a mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through an elastic material medium. Vacuum is, from classical perspective, a non-material medium, where electromagnetic waves propagate. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position.
WaterNames Preferred IUPAC nameWaterSystematic IUPAC nameOxidane (not in common use)Other names Hydrogen oxideHydrogen hydroxide (H2O or HOH)Hydroxylic acidDihydrogen monoxide (DHMO) (parody name)Dihydrogen oxideHydric acidHydrohydroxic acidHydroxic acidHydroxoic acidHydrolμ-Oxidodihydrogenκ-Hydroxylhydrogen(0)AquaNeutral liquidOxygen dihydride (may be considered incorrect)Identifiers CAS Number7732-18-53D model (JSmol)Interactive imageBeilstein Reference3587155 ChEBICHEBI:15377ChEMBLChEMBL1098659ChemSpider937DrugBankDB09145ECHA InfoCard100.028.902EC Number231-791-2Gmelin Reference117 KEGGC00001PubChemCID962RTECS numberZC0110000UNII059QF0KO0RCompTox Dashboard(EPA)DTXSID6026296InChIInChI=1S/H2O/h1H2Key: XLYOFNOQVPJJNP-UHFFFAOYSA-NSMILESOProperties Chemical formulaH2OMolar mass18.015 g·mol Appearance Almost colorless or white crystalline solid, almost colorless liquid, with a hint of blue, colorless gas OdorOdorless DensityLiquid (1 atm, VSMOW):0.99984283(84) g/mL at 0 °C0.99997495(84) g/mL at 3.983035(670) °C (temperature of maximum density, often 4 °C)0.99704702(83) g/mL at 25 °C0.96188791(96) g/mL at 95 °CSolid:0.9167 g/mL at 0 °CMelting point0.00 °C (32.00 °F; 273.15 K) Boiling point99.98 °C (211.96 °F; 373.13 K) SolubilityPoorly soluble in haloalkanes, aliphatic and aromatic hydrocarbons, ethers.
SoundDrum cadences performed by the United States Navy BandProblems playing this file? See .Sound is a phenomenon in which pressure disturbances propagate through an elasticmaterialmedium. In the context of physics, it is characterised as a mechanical wave of pressure or related quantities (e.g. displacement), whereas in physiological-psychological contexts it implies a hearing process.
BathymetryBathymetry (/bəˈθɪmətɹi/) is the study of underwater depth of ocean floors (seabed topography), river floors, or lake floors; the underwater equivalent to hypsometry or topography. The first recorded evidence of water depth measurements are from Ancient Egypt over 3000 years ago.
Water tankA water tank is a container used for storing water for many applications, including drinking water supply, irrigation, fire suppression, farming (for both plants and livestock), chemical manufacturing and food preparation. Water tank parameters include the general design of the tank, and choice of construction materials, linings.
HertzThe hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base units is 1/s or s−1, meaning that one hertz is one per second or the reciprocal of one second. It is used only in the case of periodic events.*As an Amazon Associate I earn from qualifying purchases.