Multiple choice

The state of matter with only one free surface is

  1. liquid

  2. gas

  3. solid

  4. plasma
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A liquid is a nearly incompressible fluid that conforms to the shape of its container, but retains a (nearly) constant volume independent of pressure. As such, it is one of the four fundamental states of matter (the others being solid, gas, and plasma), and is the only state with a definite volume, but no fixed shape.

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