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Threshold limit value (TLV) of CO in air is _____________ ppm?

August 29, 2021March 11, 2019 by admin

Threshold limit value (TLV) of CO in air is _____________ ppm?

A. 5
B. 50
C. 2000
D. 5000

Categories Chemical Environmental Engineering

There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth’s surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about _____________ °C/km?

Ethanolamine is an absorbent used for the removal of _____________ from air/gas?

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