The area of the Earthâ€™s surface is approximately 516 X 10^{6} km^{2}. What is the weight of the entire atmosphere in tonnes? Express your answer using scientific notation, in units of 10^{12 }tonnes.

You could use the average atmospheric pressure of 0.0066678 tonnes/square inch at the earth's surface to estimate the atmosphere's total weight.

516 X 10^6 km^2 = 8.4779 x 10^13 in^2

8.4779 x 10^13 in^2 x 0.0066678 = 0.05653 x 10^13 tonnes

= 0.5653 x 10^12 tonnes.

Thank you soo much James.. Really Apreciate it. thanks a lot again.

You are welcome

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