K2 Meter App Free Download

The metre (or meter in American spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019 the metre has been defined as the length of the path travelled by light in vacuum during a time interval of .mw-parser-output .sfrac{white-space:nowrap}.mw-parser-output .sfrac.tion,.mw-parser-output .sfrac .tion{display:inline-block;vertical-align:-0.5em;font-size:85%;text-align:center}.mw-parser-output .sfrac .num,.mw-parser-output .sfrac .den{display:block;line-height:1em;margin:0 0.1em}.mw-parser-output .sfrac .den{border-top:1px solid}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}1/299792458 of a second, where the second is defined by a hyperfine transition frequency of caesium.[2]

Metre is the standard spelling of the metric unit for length in all English-speaking nations; the exceptions are the United States[3][4][5][6] and the Philippines,[7] which use meter. Other West Germanic languages, such as German and Dutch, and North Germanic languages, such as Danish, Norwegian, and Swedish[8] use meter.[improper synthesis?]

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Christiaan Huygens found out the centrifugal force which explained variations of gravitational acceleration depending on latitude.[25][26] He also mathematically formulated the link between the length of the simple pendulum and gravitational acceleration.[27] According to Alexis Clairaut, the study of variations in gravitational acceleration was a way to determine the figure of the Earth, whose crucial parameter was the flattening of the Earth ellipsoid. In the 18th century, in addition of its significance for cartography, geodesy grew in importance as a means of empirically demonstrating the theory of gravity, which milie du Chtelet promoted in France in combination with Leibniz's mathematical work and because the radius of the Earth was the unit to which all celestial distances were to be referred. Indeed, Earth proved to be an oblate spheroid through geodetic surveys in Ecuador and Lapland and this new data called into question the value of Earth radius as Picard had calculated it.[27][28][29][21][18]

In 1893, the standard metre was first measured with an interferometer by Albert A. Michelson, the inventor of the device and an advocate of using some particular wavelength of light as a standard of length. By 1925, interferometry was in regular use at the BIPM. However, the International Prototype Metre remained the standard until 1960, when the eleventh CGPM defined the metre in the new International System of Units (SI) as equal to 1650763.73 wavelengths of the orange-red emission line in the electromagnetic spectrum of the krypton-86 atom in vacuum.[119]

The metre is defined as the path length travelled by light in a given time, and practical laboratory length measurements in metres are determined by counting the number of wavelengths of laser light of one of the standard types that fit into the length,[133] and converting the selected unit of wavelength to metres. Three major factors limit the accuracy attainable with laser interferometers for a length measurement:[127][134]

Meter is a metric measurement slightly longer than a yard; thus, a 100-meter dash might take you a second longer than a 100-yard dash. But the word has a different sense in music, where people aren't separated by whether they use the metric system. For a musician, the meter is the regular background rhythm, expressed by the "time signature" written at the beginning of a piece or section: 2/2, 2/4, 3/8, 4/4, 6/8, etc. Within a meter, you can create rhythms that range from the simple to the complex. So, for example, "America the Beautiful" is in 4/4 meter (or "4/4 time"), but so are most of the rhythmically complex songs written by Paul Simon, Burt Bacharach, or Stevie Wonder. In ordinary conversation, though, most people use "rhythm" to include meter and everything that's built on top of it. In poetry, meter has much the same meaning; however, poetic meters aren't named with numbers but instead with traditional Greek and Latin terms such as iambic and dactylic.

This attribute indicates the optimal numeric value. It must be within the range (as defined by the min attribute and max attribute). When used with the low attribute and high attribute, it gives an indication where along the range is considered preferable. For example, if it is between the min attribute and the low attribute, then the lower range is considered preferred. The browser may color the meter's bar differently depending on whether the value is less than or equal to the optimum value.

Note: Where possible, it is recommended that you use a native element rather than the meter role, as native elements are more widely supported by user agents and assistive technology.

A meter is a graphical display of a numeric value within a defined range. For example, showing battery percentage. A meter is not appropriate for values that do not have a meaningful maximum limit. Meters should not be used to indicate progress (for example loading), this should be communicated with the element.

There are some types of user interface components that, when represented in a platform accessibility API, can only contain text. Accessibility APIs do not have a way of representing semantic elements contained in a meter. To deal with this limitation, browsers, automatically apply role presentation to all descendant elements of any meter element as it is a role that does not support semantic children.

It is recommended to use a native element rather than the meter role. User agents provide a stylize widget for the element based on the current value as it relates to the min and max values. When using non-semantic elements, all features of the native semantic element need to be recreated with ARIA attributes, JavaScript and CSS.

In 1792, astronomers Pierre Mchain and Jean-Baptiste Delambre set out to measure the meter by surveying the distance between Dunkirk, France, and Barcelona, Spain. After seven or so years of effort, they arrived at their final measure and submitted it to the academy, which embodied the prototype meter as a bar of platinum.

As time passed, more and more European countries adopted the French meter as their length standard. However, while the copies of the meter bar were meant to be exact, there was no way to verify this. In 1875, the Treaty of the Meter, signed by 17 countries including the U.S., established the General Conference on Weights and Measures (Confrence Gnral des Poids et Msures, CGPM) as a formal diplomatic organization responsible for the maintenance of an international system of units in harmony with the advances in science and industry.

It was in 1927 that NIST (then known as the National Bureau of Standards) advocated for the interference patterns of energized cadmium atoms to be made a practical standard of length. This was useful because international measurement artifacts such as meter bars could not be everywhere at once; however, with proper equipment, scientists anywhere could measure the meter with cadmium. Their copies, exquisite as they might be, are not as accurate as the real thing. Neither an artifact nor its copies are suited for every measurement one might want to make. To cite one real-world example, gage blocks are length standards commonly used in machining. Because of the extremely fine work demanded of machinists, their calibration standards must be finely crafted as well. Using cadmium (and krypton) wavelengths, gage blocks could be certified to being accurate to within 0.000001 inch per every inch (1 part per million), three times closer than previously.

Building upon these and other advances, the meter was redefined by international agreement in 1983 as the length of the path traveled by light in a vacuum in 1/299,792,458 of a second. This definition also locked the speed of light at 299,792,458 meters per second in a vacuum. Length was now no longer an independent standard but rather was derived from the extremely accurate standard of time and a newly defined value for the speed of light made possible by the technology developed at NIST. e24fc04721