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1. Matter in our surroundings(9)
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The state of matter with only one free surface is
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A
liquid
💡 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.