The thing that best describes the process occurring at locations U and X is B. Water changes from a liquid to a gas.
This refers to the phase change that occurs when there is a change of water liquid to gaseous form.
This form of physical change occurs at boiling temperature.
Therefore, from the given image, the process that occurs at locations U and X is vaporization as Water changes from a liquid to a gas and the water became vapor.
There are different physical changes that occurs from W, U, and X and heat is applied in the locations U and C which changes the available water there from liquid to gaseous form.
The other forms of phase changes are:
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The complete question is:
Which best describes the process occurring at locations U and X?