<Tr> <Th> Hydrogen chloride </Th> <Td> 0.1--0.6 ppm </Td> </Tr> <Tr> <Th> Hydrogen fluoride </Th> <Td> 0.001--0.005 ppm </Td> </Tr> <P> The atmosphere of Venus is the layer of gases surrounding Venus . It is composed primarily of carbon dioxide and is much denser and hotter than that of Earth . The temperature at the surface is 740 K (467 ° C, 872 ° F), and the pressure is 93 bar (9.3 MPa), roughly the pressure found 900 m (3,000 ft) underwater on Earth . The Venusian atmosphere supports opaque clouds made of sulfuric acid, making optical Earth - based and orbital observation of the surface impossible . Information about the topography has been obtained exclusively by radar imaging . Aside from carbon dioxide, the other main component is nitrogen . Other chemical compounds are present only in trace amounts . </P> <P> Mikhail Lomonosov was the first person to hypothesize the existence of an atmosphere on Venus based on his observation of the transit of Venus of 1761 in a small observatory near his house in Saint Petersburg, Russia . </P>

What is the primary constituent of venus’s atmosphere