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Homework Help: Melting and boiling temperatures of different substances

  1. Nov 3, 2008 #1
    Hi all
    I am sorry for the double post, I just found out there is a homework help place here..
    I have this question in a practice physics exam:
    The table lists melting and boiling temperatures of 4 different substances, A,B,C,D..
    The question is "Which substance is a gas at 25 C?"

    Substance Melting point /C Boiling point/C
    A -219 -183
    B -7 58
    C 98 890
    D 1083 2582

    I have no idea how to get the answer.. Can someone please explain how..
  2. jcsd
  3. Nov 3, 2008 #2


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    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi riyada! Welcome to PF! :smile:

    A solid melts at its own melting point, and becomes a liquid.

    A liquid boils at its own boiling point, and becomes a gas.

    The question gives you the melting point and the boiling point of four substances. :smile:
  4. Nov 3, 2008 #3
    Beautifully answered!
    Its "A"..
    Thanks a MIL!!
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