science

Who

Who is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Who rather than just read about it. In short: Who or WHO most commonly refers to: Who (pronoun), an interrogative or relative pronoun World Health Organization, a specialized agency of the United Nations for public health Who or WHO may also refer to: Arts, entertainment and media Fictional characters Who, a creature in the Dr. Seuss books Horton Hears a Who! and How the Grinch Stole Christmas!

Key takeaways

Who belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Who to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Who from memory before moving on to harder problems.

Reference excerpt

Who or WHO most commonly refers to:

Who (pronoun), an interrogative or relative pronoun World Health Organization, a specialized agency of the United Nations for public health Who or WHO may also refer to:

Arts, entertainment and media

Fictional characters Who, a creature in the Dr. Seuss books Horton Hears a Who! and How the Grinch Stole Christmas! Who, a first baseman in the Abbott and Costello routine "Who's on First?"

Film Who (film), a 2018 Indian film Who? (film), a 1974 English film adaptation of Algis Budrys' novel (see below), directed by Jack Gold

Music The Who, an English rock band

Albums Who (album), by The Who, 2019 Who? (album), by Tony! Toni! Toné!, 1988

Songs "Who?" (song), written by Jerome Kern, Otto Harbach, and Oscar Hammerstein II, 1925 "Who", by David Byrne and St. Vincent from Love This Giant, 2012 "Who", by Diana Ross from Silk Electric, 1982 "Who", by Disturbed from Immortalized, 2015 "Who" (song), by Jimin from Muse, 2024 "Who", by Lauv from How I'm Feeling, 2020 "Who", by Moonbin & Sanha, 2022 "Who", by Neil Cicierega from Mouth Moods, 2017 "Who", by Sugababes, a B-side of the single "Hole in the Head", 2003 "Who", by Zayn from the film Ghostbusters, 2016 "Who...", by Ayumi Hamasaki from Loveppears, 1999 "Who", written by Irving Berlin, c. 1922–1926 "The Who", by Hieroglyphics from 3rd Eye Vision, 1998 "WHO?", by Stray Kids from the EP I Am Who, 2018

Other uses in arts, entertainment and media WHO (AM), a radio station in Des Moines, Iowa, US WHO-DT, a television station in Des Moines, Iowa, US Who (magazine), an Australian entertainment magazine Who? (novel), by Algis Budrys, 1958 W.H.O, an organisation in Marvel Comics

Other uses Who (pronoun), an interrogative or relative pronoun World Health Organization, a specialized agency of the United Nations for public health Who?, one of the Five Ws in journalism who (Unix), a Unix command White House Office, an entity within the Executive Office of the President of the United States Jim Neidhart (1955–2018), American professional wrestler with the ring name Who

See also Doctor Who (disambiguation) Guess Who (disambiguation) Hoo (disambiguation) Hu (disambiguation) Woo (disambiguation) Who? Who? ministry, a 19th-century British government Who's Who, several reference publications

Worked examples

Example 1 — a first encounter with Who

Start with the simplest possible case. Write down what Who claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Who before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Who ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Who

In research: Who appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Who in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Who is common in secondary-school and first-year university syllabi. It links to neighbouring topics Broadcast call sign disambiguation pages, Disambiguation pages, so understanding it makes those chapters shorter.
In everyday life: Look for Who outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Who in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Who means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Who out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Who in simple terms?

Who or WHO most commonly refers to: Who (pronoun), an interrogative or relative pronoun World Health Organization, a specialized agency of the United Nations for public health Who or WHO may also refer to: Arts, entertainment and media Fictional characters Who, a creature in the Dr. Seuss books Hor…

Why does Who matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Who?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Who.

Who