The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.

The boiling point of a liquid varies depending upon the surrounding environmental pressure. A liquid in a partial vacuum has a lower boiling point than when that liquid is at atmospheric pressure. A liquid at high pressure has a higher boiling point than when that liquid is at atmospheric pressure. For a given pressure, different liquids boil at different temperatures.

The normal boiling point (also called the atmospheric boiling point or the atmospheric pressure boiling point) of a liquid is the special case in which the vapor pressure of the liquid equals the defined atmospheric pressure at sea level, 1 atmosphere. At that temperature, the vapor pressure of the liquid becomes sufficient to overcome atmospheric pressure and allow bubbles of vapor to form inside the bulk of the liquid. The standard boiling point has been defined by IUPAC since 1982 as the temperature at which boiling occurs under a pressure of 1 bar.

The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas.

Boiling point may also refer to:

Film & TV

Other

The seventh series of the British medical drama television series Casualty commenced airing in the United Kingdom on BBC One on 12 September 1992 and finished on 27 February 1993.

Cast

Continuing into Series 7 were nurses Charlie Fairhead (Derek Thompson), Lisa "Duffy" Duffin (Cathy Shipton), Martin "Ash" Ashford (Patrick Robinson) and Sandra Nicholl (Maureen Beattie), registrar Julian Chapman (Nigel Le Vaillant), paramedics Josh Griffiths (Ian Bleasdale) and Jane Scott (Caroline Webster) and receptionist Norma Sullivan (Anne Kristen).

Joining the regular cast were staff general manager Kate Miller (Joanna Foster), consultant Mike Barratt (Clive Mantle), senior house officer Rob Khalefa (Jason Riddington), health care assistant Maxine Price (Emma Bird), administrator Simon Easton (Robert Daws) and locum registrar Andrew Bower (William Gaminara). Imogen Boorman played Nikki Wyatt – Ash’s girlfriend, Nicola Jeffries played receptionist Jenny and Ken Sharrock played Kevin Price – Maxine’s dad.

The pronoun who, in English, is an interrogative pronoun and a relative pronoun, used chiefly to refer to humans.

Its derived forms include whom, an objective form the use of which is now generally confined to formal English; the possessive form whose; and the emphatic form whoever (also whosoever and whom(so)ever; see also -ever).

Etymology

The word who derives from the Old English hwā. The spelling who does not correspond to the word's pronunciation /huː/; it is the spelling that represents the expected outcome of hwā, while the pronunciation represents a divergent outcome – for details see Pronunciation of English ⟨wh⟩. The word is cognate with Latin quis and Greek ποιός.

The forms whom and whose derive respectively from the Old English dative and genitive forms of hwā, namely hwām and hwæs.

Uses

As interrogative pronoun

Who and its derived forms can be used as interrogative pronouns, to form questions:

WHOM (94.9 FM, "94.9 WHOM") is an American radio station which airs an adult contemporary format. It transmits from atop Mount Washington in New Hampshire, the tallest peak in the Northeast. WHOM's signal can be heard in five states and part of Canada (New Hampshire, Maine, Vermont, Massachusetts, New York and Quebec). While the station can be heard all over Northern New England, WHOM broadcasts from and considers itself part of the Portland, Maine radio market. WHOM claims on its website that it has the largest coverage area of any FM station in the USA. The station also streams its programming over the internet from its official web page. It is owned by Townsquare Media.

WHOM promotes its programming as "safe for the whole family." In addition to local DJs, the station also airs the syndicated John Tesh radio show.

History

WHOM traces its history to the 1940s as a weather station, sending temperature and climate readings from atop Mount Washington to meteorologists in Boston. As an FM station for the general public, WHOM signed on the air July 9, 1958 as WMTW-FM, owned by Mount Washington Television (an ownership group that included former Maine governor Horace Hildreth) along with WMTW-TV (channel 8). The WMTW stations were sold to Jack Paar of Tonight Show fame in 1963; Paar, in turn, sold them to Mid New York Broadcasting in 1967.