Some thermometers have mercury in it. Mercury is extremely cold at night. Throughout 2015, we’ll be exploring the Solar System. That’s four times hotter than boiling water. The mercury rises when its hot, and goes down when it's cold. And unlike Mercury, it's hot everywhere, even at night time. Today, we begin our exploration of the planet Mercury. Since Mercury is the closest planet to the Sun, spins slowly, and does not have much of an atmosphere to trap heat, its temperature varies greatly. Mercury: Mercury is one of the four terrestrial planets in our solar system. The planet Mercury has the most extreme degrees of hot and cold temperatures. Question: Is Mercury a hot or cold planet? How hot is Mercury? Mercury's temperatures can go between -279 Fahrenheit (-173 Celsius) at night to 801 Fahrenheit (427 Celsius) during the day. In January, we visited the Sun. In most instances the atomic mercury is swept through an … The advantages of using mercury is to tell what temperature it is outside. Ionic mercury in acidic solution will be reduced by stannous ions producing ground state atomic mercury. So, the part of the planet that is exposed to Sun (mercurian day) is very hot (molten metal lakes), and the face not exposed (mercurian night) is cooled to sub freeze temperature. While it rarely reaches past 32 degrees Celsius in Colombo, temperatures can go more than 400 degrees Celsius during the day. Mercury is the smallest planet in the Solar System (unless you insist on calling Pluto a planet). Because the planet has such extreme temperatures it has no atmosphere. Let’s start with a few basic facts that pretty much everyone knows. The processes occurring in the mercury cold vapor technique are simple but they can be affected by numerous factors. mercury is the first planet in the solar system, and the distance between it and Sun are minimal. 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