A. an atom
B. an electron
C. a proton
D. a neutron
Correct Answer: Option A
A. an atom
![A simple barometer is constructed using a liquid Q1 of density 16.2g/cm³. Calculate the least length of the tube to be used to measure the pressure of 1.5atm. [Density of mercury = 13.6g/cm³, 1atm = 76.0 cm of Mercury]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A simple barometer is constructed using a liquid Q1 of density 16.2g/cm³. Calculate the least length of the tube to be used to measure the pressure of 1.5atm. [Density of mercury = 13.6g/cm³, 1atm = 76.0 cm of Mercury]")
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