Other uncommon metric units of area include the tetrad, the hectad, and the myriad.

1 international acre is equal to the following metric units:

It is still used in metric English-speaking countries ( such as Canada ), and remains the standard unit of classification for air conditioning units manufactured and sold in many non-English-speaking metric countries.

Conversion between units in the metric system can be discerned by their prefixes ( for example, 1 kilogram

The centimetre – gram – second system ( abbreviated CGS or cgs ) is a variant of the metric system of physical units based on centimetre as the unit of length, gram as a unit of mass, and second as a unit of time.

The metric tensor in units where the speed of light is one is:

Category: Non-SI metric units

A typical tape measure with both Metric system | metric and United States customary units | US units and two Us penny | US pennies for comparison

While the CIA Factbook in 2006 stated that the " US is the only industrialized nation that does not mainly use the metric system ", ( in addition to non-industrialised Burma / Myanmar, Liberia ), the actual situation, however, is more complicated than the CIA Factbook would suggest-in the United Kingdom, for example, although metric is the official system for most regulated trading by weight or measure purposes, the pint is the official unit for milk in returnable bottles and for draught beer and cider in British pubs, and miles, yards and feet remain the official units for road signage.

The United States mandated the acceptance of the metric system in 1866 for commercial and legal proceedings, without displacing their customary units.

Both Liberia and Myanmar are substantially metric countries, trading internationally in metric units.

Visiting advocates of metrication also claim that they use metric units for many things internally with exceptions such as old petrol pumps in Myanmar, calibrated in British Imperial gallons.

Most countries have adopted the metric system officially over a transitional period where both units are used for a set period of time.

If c, h, and e were all changed so that the values they have in metric ( or any other ) units were different when we looked them up in our tables of physical constants, but the value of α remained the same, this new world would be observationally indistinguishable from our World.

China has since become the world's largest producer of freshwater pearls, producing more than 1, 500 metric tons per year ( in addition to metric measurements, Japanese units of measurement such as the kan and momme are sometimes encountered in the pearl industry ).

Other units of power include ergs per second ( erg / s ), horsepower ( hp ), metric horsepower ( Pferdestärke ( PS ) or cheval vapeur, CV ), and foot-pounds per minute.

Of units customarily used in trade in France, the myriagramme ( 10 kg ) was the metric replacement for an avoirdupois unit, the quarter ( 25 pounds ).

In the last five to six decades, professionals and scientists using the metric system of units defined the standard reference conditions of temperature and pressure for expressing gas volumes as being and 101. 325 KPa ( 1 atm or 760 Torr ).

The unification of space and time is exemplified by the common practice of selecting a metric ( the measure that specifies the interval between two events in spacetime ) such that all four dimensions are measured in terms of units of distance: representing an event as ( in the Lorentz metric ) or ( in the original Minkowski metric ) where is the speed of light.

* If the metric space X is compact and an open cover of X is given, then there exists a number such that every subset of X of diameter < δ is contained in some member of the cover.

There are a number of topological properties which are equivalent to compactness in metric spaces, but are inequivalent in general topological spaces.

In mathematics, a contraction mapping, or contraction, on a metric space ( M, d ) is a function f from M to itself, with the property that there is some nonnegative real number < math > k < 1 </ math > such that for all x and y in M,

Despite its being a non-metric unit, a number of metric countries have used this unit for its limited range of application.

The space Q < sub > p </ sub > of p-adic numbers is complete for any prime number p. This space completes Q with the p-adic metric in the same way that R completes Q with the usual metric.

In this setting, the distance between two points and is gauged not by a real number via the metric in the comparison < math >

In mathematics, the Hausdorff dimension ( also known as the Hausdorff – Besicovitch dimension ) is an extended non-negative real number associated with any metric space.

The annual number of calls for service to police departments per room (" CFS / room ") as a metric has been used to identify motels with poor surveillance of visitors, inadequate staff or management unwilling to pro-actively exclude known or likely problem tenants from their clientele.

This may imply that the traditional RBI ( runs batted in ) is an effective metric ; however, sabermetricians also reject RBI, for a number of reasons.

There are anecdotal objections to the use of metric units in carpentry and the building trades, on the basis that it is easier to remember an integer number of inches plus a fraction than a measurement in millimeters, or that inch measurements are more suitable when distances are frequently divided by two.

Given metric spaces ( X, d < sub > 1 </ sub >) and ( Y, d < sub > 2 </ sub >), a function f: X → Y is called uniformly continuous if for every real number ε > 0 there exists δ > 0 such that for every x, y ∈ X with d < sub > 1 </ sub >( x, y ) < δ, we have that d < sub > 2 </ sub >( f ( x ), f ( y )) < ε.

In high availability applications, a metric known as nines, corresponding to the number of nines following the decimal point, is used.

Since most such codes correct only bit-flips, but not bit-insertions or bit-deletions, the Hamming distance metric is the appropriate way to measure the number of bit errors.

RIP uses number of hops, or gateways traversed, as its metric.

Thus, the reading for metric micrometers of this type is the number of whole millimetres ( if any ) and the number of hundredths of a millimetre, as with an ordinary micrometer, and the number of thousandths of a millimetre given by the coinciding vernier line on the sleeve vernier scale.

Although a number of variants of the metric system emerged in the late nineteenth and early twentieth centuries the term is now often used as a synonym for the " International System of Units "-the official system of measurement in almost every country in the world.

It is this number which constitutes the basic metric used in astronomy and is known as 1 solar luminosity, the symbol for which is.

The unit interval is a complete metric space, homeomorphic to the extended real number line.

When South Africa adopted the metric system, it adopted the comma as its decimal mark, although a number of house styles, including leading newspapers like The Star and The Sunday Times continue to use the decimal point.

The estimated number of tomatoes used are around 150, 000 i. e. over 40 metric tons.

To see the problem clearly, imagine a subnet connected like as A-B-C-D-E-F, and let the metric between the routers be " number of jumps ".

In most of the world, recipes use the metric system of litres ( l ) and millilitres ( ml ), grams ( g ) and kilograms ( kg ), and degrees Celsius (° C ).

The mark was rated as 3798 Grains, English troy, or 246. 084 metric grams.

The fact that an animal weighing over 4. 5 metric tons ( 5 short tons ) could have a brain of no more than 80 grams ( 2. 8 oz ) contributed to the popular old idea that dinosaurs were unintelligent, an idea now largely rejected.

A long ton then is exactly 1, 016, 046. 9088 grams, which is approximately 1, 016 kg – conveniently close to a metric tonne.

Guan Yu's guan dao was called " Green Dragon Crescent Blade " ( 青龍偃月刀 ) which weighed 82 Chinese jin ( estimated either at 18. 263 kg or 48. 38 kg — a Han Dynasty jin was 222. 72 grams in the metric system, while the jin used in the Ming Dynasty — during which the Romance of the Three Kingdoms was written — was about 590 grams ).

Canadians are exposed to both metric and imperial units, and it is not unusual for there to be references to both metres and feet, acres and hectares, and grams and ounces in the same conversation.