NCERT Exercise 1.17 - Units and Measurement
Question: The Sun is a hot plasma with its inner core at a temperature exceeding 10⁷ K and its outer surface at about 6000 K. At these temperatures no substance remains solid or liquid. Would you expect the Sun's mass density to lie in the range of solids and liquids or gases? Check your guess using: mass of the Sun = 2.0 × 10³⁰ kg and radius of the Sun = 7.0 × 10⁸ m.
Answer: The Sun's mean density is approximately **1.4 × 10³ kg m⁻³** (or **1.4 g cm⁻³**), which lies in the range of liquids and solids rather than ordinary gases.
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