W. W. Rouse Ball

Walter William Rouse Ball, known as W. W. Rouse Ball (14 August 1850 – 4 April 1925), was a British mathematician, lawyer, and fellow at Trinity College, Cambridge from 1878 to 1905. He was also a keen amateur magician, and the founding president of the Cambridge Pentacle Club in 1919, one of the world's oldest magic societies.

Life

Ball was the son and heir of Walter Frederick Ball, of 3, St John's Park Villas, South Hampstead, London. Educated at University College School, he entered Trinity College, Cambridge in 1870, became a scholar and first Smith's Prizeman, and gained his BA in 1874 as second Wrangler. He became a Fellow of Trinity in 1875, and remained one for the rest of his life.

He is buried at the Parish of the Ascension Burial Ground in Cambridge.

He is commemorated in the naming of the small pavilion, now used as changing rooms and toilets, on Jesus Green in Cambridge.

Books

Wrocław

Wrocław (/ˈvrɒtswəf/; Polish pronunciation: [ˈvrɔt͡swaf], German: Breslau, [bʁɛs̬laʊ]; Latin: Vratislavia) is the largest city in western Poland. It is on the River Oder in the Silesian Lowlands of Central Europe, roughly 350 kilometres (220 mi) from the Baltic Sea to the north and 40 kilometres (25 mi) from the Sudeten Mountains to the south. Wrocław is the historical capital of Silesia and Lower Silesia. Today, it is the capital of the Lower Silesian Voivodeship. At various times in history, it has been part of the Kingdom of Poland, Bohemia, Hungary, the Austrian Empire, Prussia, and Germany. It became part of Poland in 1945, as a result of the border changes after the Second World War. The population of Wrocław in 2014 was 634,487, making it the fourth-largest city in Poland.

Wrocław classified as a global city by GaWC, with the ranking of high sufficiency and living standard. It was among 230 cities in the world in the ranking of the consulting company Mercer - "Best City to Live" in 2015 and the only Polish city in this ranking has been recognized as a city growing at the business center.

Mass fraction (chemistry)

In chemistry, the mass fraction is the ratio of one substance with mass to the mass of the total mixture , defined as

The sum of all the mass fractions is equal to 1:

Mass fraction can also be expressed, with a denominator of 100, as percentage by mass (frequently, though erroneously, called percentage by weight, abbreviated wt%). It is one way of expressing the composition of a mixture in a dimensionless size; mole fraction (percentage by moles, mol%) and volume fraction (percentage by volume, vol%) are others.

For elemental analysis, mass fraction (or "mass percent composition") can also refer to the ratio of the mass of one element to the total mass of a compound. It can be calculated for any compound using its empirical formula or its chemical formula

Terminology

"Percent concentration" does not refer to this quantity. This improper name persists, especially in elementary textbooks. In biology, the unit "%" is sometimes (incorrectly) used to denote mass concentration, also called "mass/volume percentage." A solution with 1 g of solute dissolved in a final volume of 100 mL of solution would be labeled as "1 %" or "1 % m/v" (mass/volume). This is incorrect because the unit "%" can only be used for dimensionless quantities. Instead, the concentration should simply be given in units of g/mL. "Percent solution" or "percentage solution" are thus terms best reserved for "mass percent solutions" (m/m = m% = mass solute/mass total solution after mixing), or "volume percent solutions" (v/v = v% = volume solute per volume of total solution after mixing). The very ambiguous terms "percent solution" and "percentage solutions" with no other qualifiers continue to occasionally be encountered.

WW

WW may refer to:

In entertainment:

Māori language

Maori or Māori (/ˈmaʊəri/; Māori pronunciation: [ˈmaː.ɔ.ɾi]) is an Eastern Polynesian language spoken by the Māori people, the indigenous population of New Zealand. Since 1987, it has been one of New Zealand's official languages. It is closely related to Cook Islands Māori, Tuamotuan, and Tahitian.

According to a 2001 survey on the health of the Māori language, the number of very fluent adult speakers was about 9% of the Māori population, or 30,000 adults. A national census undertaken in 2006 says that about 4% of the New Zealand population, or 23.7% of the Maori population could hold a conversation in Maori about everyday things.

Name

The English word comes from the Maori language, where it is spelled "Māori". In New Zealand the Maori language is commonly referred to as Te Reo [tɛ ˈɾɛ.ɔ] "the language", short for te reo Māori.

The spelling "Maori" (without macron) is standard in English outside New Zealand in both general and linguistic usage. The Maori-language spelling "Māori" (with macron) has become common in New Zealand English in recent years, particularly in Maori-specific cultural contexts, although the traditional English spelling is still prevalent in general media and government use.

Waw (letter)

Waw (wāw "hook") is the sixth letter of the Semitic abjads, including Phoenician wāw , Aramaic waw , Hebrew vav (also vau) ו, Syriac waw ܘ and Arabic wāw و (sixth in abjadi order; 27th in modern Arabic order).

It represents the consonant [w] (in Modern Hebrew also [v]) and the vowel [u].

It is the origin of Greek Ϝ (digamma), Υ (upsilon) and Latin F, V and the derived letters U, W, Y.

Hebrew Waw

Hebrew spelling: וָו

Pronunciation in Modern Hebrew

Vav has three orthographic variants, each with a different phonemic value and phonetic realisation:

In modern Hebrew, the frequency of the usage of vav, out of all the letters, is about 10.00%.

Vav as consonant

Consonantal vav (ו) generally represents a voiced labiodental fricative (like the English v) in Ashkenazi, European Sephardi, Persian, Caucasian, Italian and modern Israeli Hebrew, and was originally a labial-velar approximant /w/. It is pronounced, like in Arabic, as a [w] by some Jews of Mizrahi origin.

In modern Israeli Hebrew, some loanwords, the pronunciation of whose source contains /w/, and their derivations, are pronounced with [w]: ואחד – /ˈwaχad/ (but: ואדי – /ˈvadi/).

W.W. (automobile)

W.W. (Winter), was an early British car made by Winter and Company of Wandsworth, London. They made two models between 1913 and 1914.

The first car, the W.W. of 1913 was a light car powered by an 8hp V-twin engine bought in from the Precision company. This drove the rear wheels through a gear box by Chater-Lea and shaft drive to a worm gear final drive on the rear axle.

For 1914 production changed to a cyclecar. This was sold as a Winter and had a Blumfield engine and friction drive with belt to the rear axle.

The number made is not known.

See also

References