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The Equatorial Counter Current is an eastward flowing, wind-driven current which extends to depths of 100–150 metres (330–490 ft) in the Atlantic, Indian, and Pacific Oceans. More often called the North Equatorial Countercurrent (NECC), this current flows west-to-east at about 3-10°N in the Atlantic, Indian Ocean and Pacific basins ...
The knot ( / nɒt /) is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.151 mph or 0.514 m/s ). [ 1][ 2] The ISO standard symbol for the knot is kn. [ 3] The same symbol is preferred by the Institute of Electrical and Electronics Engineers ( IEEE ), while kt is also common, especially in aviation, where ...
Hemocytometer grid (see table) The hemocytometer (or haemocytometer) is a counting-chamber device originally designed and usually used for counting blood cells. [ 1] The hemocytometer was invented by Louis-Charles Malassez and consists of a thick glass microscope slide with a rectangular indentation that creates a precision volume chamber.
Around the Moon. Twenty Thousand Leagues Under the Seas ( French: Vingt Mille Lieues sous les mers) is a science fiction adventure novel by the French writer Jules Verne. It is often considered a classic within both its genres and world literature . The novel was originally serialised from March 1869 to June 1870 in Pierre-Jules Hetzel 's ...
Geiger–Müller tube. A complete Geiger counter, with the Geiger–Müller tube mounted in a cylindrical enclosure connected by a cable to the instrument. The Geiger–Müller tube or G–M tube is the sensing element of the Geiger counter instrument used for the detection of ionizing radiation. It is named after Hans Geiger, who invented the ...
4 oxygen cycles at 60 fsw followed by a minimum of 9 oxygen cycles at 30 fsw. 5 to 8 oxygen cycles at 60 fsw followed by a minimum of 12 oxygen cycles at 30 fsw. Tenders breathe oxygen for 60 minutes at 30 fsw. Further treatments may follow after at least 12 hours on air at the surface.
Geothermal gradient is the rate of change in temperature with respect to increasing depth in Earth 's interior. As a general rule, the crust temperature rises with depth due to the heat flow from the much hotter mantle; away from tectonic plate boundaries, temperature rises in about 25–30 °C/km (72–87 °F/mi) of depth near the surface in ...
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 980 ft), though modern technology ...