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23-487: The ship was 85.19 m (279 ft 6 in) long, with a beam of 13.49 m (44 ft 3 in). She had a depth of 4.78 m (15 ft 8 in). She was assessed as 1,925  GRT , 936  NRT , 3,118  DWT . The ship was propelled by a compound steam engine , which had two cylinders of 42 cm (16 9 ⁄ 16 inches) and two cylinders of 90 cm (35 7 ⁄ 16 inches) diameter by 90 cm (35 7 ⁄ 16 inches) stroke. The engine

46-409: A manner that prevents their aggregation into units of measurement . Typically expressed as ratios that align with another system, these quantities do not necessitate explicitly defined units . For instance, alcohol by volume (ABV) represents a volumetric ratio ; its value remains independent of the specific units of volume used, such as in milliliters per milliliter (mL/mL). The number one

69-720: A ratio of volumes (volumetric moisture, m ⋅m , dimension L ⋅L ) or as a ratio of masses (gravimetric moisture, units kg⋅kg , dimension M⋅M ); both would be unitless quantities, but of different dimension. Certain universal dimensioned physical constants, such as the speed of light in vacuum, the universal gravitational constant , the Planck constant , the Coulomb constant , and the Boltzmann constant can be normalized to 1 if appropriate units for time , length , mass , charge , and temperature are chosen. The resulting system of units

92-571: Is mass fractions or mole fractions , often written using parts-per notation such as ppm (= 10 ), ppb (= 10 ), and ppt (= 10 ), or perhaps confusingly as ratios of two identical units ( kg /kg or mol /mol). For example, alcohol by volume , which characterizes the concentration of ethanol in an alcoholic beverage , could be written as mL / 100 mL . Other common proportions are percentages %  (= 0.01),   ‰  (= 0.001). Some angle units such as turn , radian , and steradian are defined as ratios of quantities of

115-473: Is a related concept in statistics. The concept may be generalized by allowing non-integer numbers to account for fractions of a full item, e.g., number of turns equal to one half. Dimensionless quantities can be obtained as ratios of quantities that are not dimensionless, but whose dimensions cancel out in the mathematical operation. Examples of quotients of dimension one include calculating slopes or some unit conversion factors . Another set of examples

138-518: Is equal to 100 cubic feet (2.83 m ). Replaced by Gross Tonnage (GT), gross register tonnage uses the total permanently enclosed capacity of the vessel as its basis for volume. Typically this is used for dockage fees, canal transit fees, and similar purposes where it is appropriate to charge based on the size of the entire vessel. Internationally, GRT may be abbreviated as BRT for the German " Bruttoregistertonne ". Net register tonnage subtracts

161-494: Is formalized as quantity number of entities (symbol N ) in ISO 80000-1 . Examples include number of particles and population size . In mathematics, the "number of elements" in a set is termed cardinality . Countable nouns is a related linguistics concept. Counting numbers, such as number of bits , can be compounded with units of frequency ( inverse second ) to derive units of count rate, such as bits per second . Count data

184-501: Is recognized as a dimensionless base quantity . Radians serve as dimensionless units for angular measurements , derived from the universal ratio of 2π times the radius of a circle being equal to its circumference. Dimensionless quantities play a crucial role serving as parameters in differential equations in various technical disciplines. In calculus , concepts like the unitless ratios in limits or derivatives often involve dimensionless quantities. In differential geometry ,

207-446: The π theorem (independently of French mathematician Joseph Bertrand 's previous work) to formalize the nature of these quantities. Numerous dimensionless numbers, mostly ratios, were coined in the early 1900s, particularly in the areas of fluid mechanics and heat transfer . Measuring logarithm of ratios as levels in the (derived) unit decibel (dB) finds widespread use nowadays. There have been periodic proposals to "patch"

230-521: The International Maritime Organization (IMO) adopted The International Convention on Tonnage Measurement of Ships on 23 June 1969. The new tonnage regulations entered into force for all new ships on 18 July 1982, but existing vessels were given a migration period of 12 years to ensure that ships were given reasonable economic safeguards, since port and other dues are charged according to ship's tonnage. Since 18 July 1994

253-480: The 1960s, Ryazan was allocated the IMO Number 5294113. She served until 1979, when she was sold to Echkardt & Co., Hamburg , West Germany and was renamed Rudi . She was scrapped in 1979 at Santander, Spain . Gross register tonnage Gross register tonnage ( GRT , grt , g.r.t. , gt ), or gross registered tonnage , is a ship's total internal volume expressed in "register tons", each of which

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276-643: The SI system to reduce confusion regarding physical dimensions. For example, a 2017 op-ed in Nature argued for formalizing the radian as a physical unit. The idea was rebutted on the grounds that such a change would raise inconsistencies for both established dimensionless groups, like the Strouhal number , and for mathematically distinct entities that happen to have the same units, like torque (a vector product ) versus energy (a scalar product ). In another instance in

299-541: The early 2000s, the International Committee for Weights and Measures discussed naming the unit of 1 as the " uno ", but the idea of just introducing a new SI name for 1 was dropped. The Buckingham π theorem indicates that validity of the laws of physics does not depend on a specific unit system. A statement of this theorem is that any physical law can be expressed as an identity involving only dimensionless combinations (ratios or products) of

322-442: The field of dimensional analysis . In the 19th century, French mathematician Joseph Fourier and Scottish physicist James Clerk Maxwell led significant developments in the modern concepts of dimension and unit . Later work by British physicists Osborne Reynolds and Lord Rayleigh contributed to the understanding of dimensionless numbers in physics. Building on Rayleigh's method of dimensional analysis, Edgar Buckingham proved

345-436: The gross and net tonnages, dimensionless indices calculated from the total moulded volume of the ship and its cargo spaces by mathematical formulae , have been the only official measures of the ship's tonnage. However, the gross and net register tonnages are still widely used in describing older ships. Dimensionless Dimensionless quantities , or quantities of dimension one, are quantities implicitly defined in

368-520: The number (say, k ) of independent dimensions occurring in those variables to give a set of p = n − k independent, dimensionless quantities . For the purposes of the experimenter, different systems that share the same description by dimensionless quantity are equivalent. Integer numbers may represent dimensionless quantities. They can represent discrete quantities, which can also be dimensionless. More specifically, counting numbers can be used to express countable quantities . The concept

391-462: The same kind. In statistics the coefficient of variation is the ratio of the standard deviation to the mean and is used to measure the dispersion in the data . It has been argued that quantities defined as ratios Q = A / B having equal dimensions in numerator and denominator are actually only unitless quantities and still have physical dimension defined as dim Q = dim A × dim B . For example, moisture content may be defined as

414-628: The use of dimensionless parameters is evident in geometric relationships and transformations. Physics relies on dimensionless numbers like the Reynolds number in fluid dynamics , the fine-structure constant in quantum mechanics , and the Lorentz factor in relativity . In chemistry , state properties and ratios such as mole fractions concentration ratios are dimensionless. Quantities having dimension one, dimensionless quantities , regularly occur in sciences, and are formally treated within

437-427: The variables linked by the law (e. g., pressure and volume are linked by Boyle's Law – they are inversely proportional). If the dimensionless combinations' values changed with the systems of units, then the equation would not be an identity, and Buckingham's theorem would not hold. Another consequence of the theorem is that the functional dependence between a certain number (say, n ) of variables can be reduced by

460-554: The volume of spaces not available for carrying cargo, such as engine rooms, fuel tanks and crew quarters, from gross register tonnage. Gross register tonnage is not a measure of the ship's weight or displacement and should not be confused with terms such as deadweight tonnage or displacement . Gross register tonnage was defined by the Moorsom Commission in 1849. Gross and net register tonnages were replaced by gross tonnage and net tonnage , respectively, when

483-565: Was Riga and the Code Letters UKED were allocated. On 12 November 1956, dockers at Liverpool , Lancashire , United Kingdom refused to work on Ryazan , which had arrived from Riga and was to load a cargo of rubber . They were angry at the situation in Hungary . The dockers refused to load her cargo on to a Danish ship, saying "we won't handle any cargo for Russia". Ryazan sailed for Riga on 19 November. With their introduction in

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506-482: Was built by Flensberger Schiffsbau-Geschellschaft. Rated at 1,200 IHP , it could propel the ship at 10.5 knots (19.4 km/h). Licentia was a Hansa A Type cargo ship built in 1944 as yard number 467 by Flensburger Schiffbau-Gesellschaft , Flensburg , Germany for J Jost, Flensburg. She was launched on 19 August 1944 and completed on 14 November. Licentia was seized as a prize of war at Flensburg in May 1945, and

529-517: Was passed to the Ministry of War Transport . She was renamed Empire Gabon . The Code Letters GNFX and United Kingdom Official Number 180675 were allocated. Her port of registry was London and she was operated under the management of Ellerman's Wilson Line Ltd , Hull , Yorkshire . In 1946, Empire Gabon was allocated to the Soviet Union . She was renamed Ryazan . Her port of registry

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