An example of an extensive property of matter is mass , it is the amount of matter in a body. To measure it is used, as with weight, the kilogram. It is a scalar magnitude. there other examples of extensive property such as weight, volumen, length, potential energy, heat capacity and inertia.
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In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.
Answer: helium
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Edit: im really sorry i thought i was answering a different question.
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Would it be<em><u> 7.69 seconds</u></em>?
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