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Australian manual of scientific style Start communicating effectively
That and which
Choosing between that and which depends on whether the following clause is essential to the meaning of the sentence (ie a defining clause), or whether it simply adds extra information that would not change the meaning if it was removed (a nondefining clause).
Use that if the clause is essential; use which if it is not. A nondefining clause is offset with commas:
Go to the first house that is brick and knock on the door.
[This means go the first brick house – there may be other houses built of other materials before the brick house; if you took out ‘that is brick’, you would not go to the right house (it changes the meaning).]
Go to the first house, which is brick, and knock on the door.
[This means go to the first house, and it happens to be brick; if you took out ‘which is brick’, you would still go to the right house (it does not change the meaning).]