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  2. Water Resistant mark - Wikipedia

    en.wikipedia.org/wiki/Water_Resistant_mark

    Water Resistant is a common mark stamped on the back of wrist watches to indicate how well a watch is sealed against the ingress of water. It is usually accompanied by an indication of the static test pressure that a sample of newly manufactured watches were exposed to in a leakage test. The test pressure can be indicated either directly in ...

  3. Diving watch - Wikipedia

    en.wikipedia.org/wiki/Diving_watch

    Monitoring dive time by the diver. A diving watch, also commonly referred to as a diver's or dive watch, is a watch designed for underwater diving that features, as a minimum, a water resistance greater than 1.1 MPa (11 atm), the equivalent of 100 m (330 ft). The typical diver's watch will have a water resistance of around 200 to 300 m (660 to ...

  4. List of thermal conductivities - Wikipedia

    en.wikipedia.org/wiki/List_of_thermal_conductivities

    Let K0 is the normal conductivity at one bar (10 5 N/m 2) pressure, Ke is its conductivity at special pressure and/or length scale. Let d is a plate distance in meters, P is an air pressure in Pascals (N/m 2), T is temperature Kelvin, C is this Lasance constant 7.6 ⋅ 10 −5 m ⋅ K/N and PP is the product P ⋅ d/T.

  5. Amfibia - Wikipedia

    en.wikipedia.org/wiki/Amfibia

    Modern Vostok Amphibia, model 090916. Amfibia (often spelled "Amphibia" or "Amphibian") is a Russian dive watch. It uses a mechanical watch movement available in both manual and automatic winding forms. The Amfibia was developed at the Vostok watch factory in 1967. [1] It later gained worldwide popularity due to its reliable reputation and low ...

  6. L'impermeable - Wikipedia

    en.wikipedia.org/wiki/L'impermeable

    The watchmaker company "Alcide Droz & Sons", established in St-Imier ( Bern) since 1864, developed the first watch attested waterproof. They called it "L'Impermeable". They had the idea to place a seal in the crown of winder, which is screwed on the counterpart. "L'Impermeable" was born: it is the very first waterproof watch intended especially ...

  7. Triple point - Wikipedia

    en.wikipedia.org/wiki/Triple_point

    For example, the triple point at 251 K (−22 °C) and 210 MPa (2070 atm) corresponds to the conditions for the coexistence of ice Ih (ordinary ice), ice III and liquid water, all at equilibrium. There are also triple points for the coexistence of three solid phases, for example ice II , ice V and ice VI at 218 K (−55 °C) and 620 MPa (6120 atm).

  8. Properties of water - Wikipedia

    en.wikipedia.org/wiki/Properties_of_water

    Water is the chemical substance with chemical formula H 2 O; one molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. [25] Water is a tasteless, odorless liquid at ambient temperature and pressure. Liquid water has weak absorption bands at wavelengths of around 750 nm which cause it to appear to have a blue color. [3]

  9. Vacuum - Wikipedia

    en.wikipedia.org/wiki/Vacuum

    A submarine maintaining an internal pressure of 1 atmosphere submerged to a depth of 10 atmospheres (98 metres; a 9.8-metre column of seawater has the equivalent weight of 1 atm) is effectively a vacuum chamber keeping out the crushing exterior water pressures, though the 1 atm inside the submarine would not normally be considered a vacuum.

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