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Reading Comprehension
Volume 2, Number 11, May 5, 1997
www.rhlschool.com

Forms of Matter

     Most substances take three different __1__, depending on their
temperatures. Those forms are solid, liquid, and gas.
     Water is a good example. Interestingly, we have different __2__ for
water when it takes different forms. When water is a __3__, we call it
ice. When its temperature is great enough to be a __4__, we usually
call it water. As it becomes a gas we call it steam, and then the gas is
usually referred to as water vapor.
     Many substances tend to __5__ in one form over a great
temperature range. We call oxygen a gas, but scientists can __6__ it to
a point where it becomes a liquid used in rockets. Have you ever seen
dry ice? It’s the “gas” carbon dioxide, at a temperature __7__ enough to
make it a solid. We certainly think of __8__ as solid, but __9__ them
enough and they become liquids. The lava that __10__ from a volcano
is an example of liquid rock.
     What form must a particular substance take? Better check with a
thermometer to be sure.


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Copyright 1997 RHL