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A solid-state drive (SSD) is a type of solid-state storage device that uses integrated circuits to store data persistently. It is sometimes called semiconductor storage device, solid-state device, and solid-state disk. [1][2] SSDs rely on non-volatile memory, typically NAND flash, to store data in memory cells.
149.6 Gm (93.0 million mi; 1.0 au) – average distance between the Earth and the Sun – the original definition of the astronomical unit; 199 Gm (1.3 au) – diameter of Rho Persei, an asymptotic giant branch star, fusing carbon into neon in a shell surrounding an inert core. [165] 228 Gm (1.5 au) – distance between Mars and the Sun
The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. Until the mid-1920s, the unit for loss was miles of standard cable (MSC). 1 MSC corresponded to the loss of power over one mile (approximately 1.6 km) of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to a ...
This definition ultimately became the statement that 1 IT calorie is exactly 4.1868 J. [4] [8] The Btu is then calculated from the calorie as is done for the thermochemical definitions of the BTU and the calorie, as in International standard ISO 31-4 Quantities and units—Part 4: Heat and British Standard BS 350:Part 1:1974 Conversion factors ...
macOS. macOS, originally Mac OS X, previously shortened as OS X, is an operating system developed and marketed by Apple since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and laptop computers, it is the second most widely used desktop OS, after Microsoft Windows and ahead of all Linux ...
The UK has a direct train between London and Paris which takes 2hrs 16mins [313] called the Eurostar, it travels through the Channel Tunnel under the English Channel, at 23.5 miles long it is the world's longest undersea tunnel. [314] There is also a car service through the tunnel to France called LeShuttle.
The United Arab Emirates is a federal constitutional monarchy made up from a federation of seven hereditary tribal monarchy-styled political units called Sheikhdoms. It is governed by a Federal Supreme Council made up of the ruling Sheikhs of Abu Dhabi, Ajman, Fujairah, Sharjah, Dubai, Ras Al Khaimah and Umm Al Quwain.
These meet at a single point called the triple point, where all three phases can coexist. The triple point is at a temperature of 273.16 K (0.01 °C; 32.02 °F) and a pressure of 611.657 pascals (0.00604 atm; 0.0887 psi); [ 71 ] it is the lowest pressure at which liquid water can exist.