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Surface tension of a liquid is $70 \text{dyne}/cm$. Its value in SI is
Explanation
$S = 70 \text{dyne}/cm = (70 \times 10^{-5}N)/(10^{-2}m) = 70 \times 10^{-3}N/m$.
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$S = 70 \text{dyne}/cm = (70 \times 10^{-5}N)/(10^{-2}m) = 70 \times 10^{-3}N/m$.