Entries - W

W boson

A fundamental particle and a carrier of the electroweak force. There are two separate W bosons, W+ and W- , which have opposite electric charges.



Lower case, and likewise for web page, web address (but three cap Ws and no hyphen for the World Wide Web, in the unlikely event that you ever need to refer to it that way).


One word.


One word.



The force exerted on the mass of a body by a gravitational field.

Do not confuse weight with mass.


which or that?

This is quite easy, really: "that" defines, "which" gives extra information (often in a clause enclosed by commas):

This is the house that Jack built; but this house, which John built, is falling down.
The Guardian, which I read every day, is the paper that I admire above all others.
I am very proud of the sunflowers that I grew from seed (some of the sunflowers);
I am very proud of the sunflowers, which I grew from seed (all the sunflowers).


White Paper

Capital W, capital P.

A White Paper is an authoritative report or guide helping readers understand an issue, solve a problem, or make a decision.

CERN openlab – the public-private partnership between CERN, leading IT companies and research institutes – today released a White Paper on future IT challenges in scientific research.


Who or which?

While in normal circumstances 'who' is only used to refer to people and 'which' or 'that' to refer to things, we try on the home.cern website to refer to departments and organisations (since they are made up of people) as 'who'.



word count

Use the following word counts for content types on the public website. These formats are defined in detail under Formats tab above. You'll notice from the table that word counts in French are approximately 30% longer.


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