What is the only metal that is liquid at room temperature?

The only metal that is liquid at room temperature is mercury. It is a heavy, silvery-white metal that is also known as quicksilver. Mercury has a low melting point of -38.83°C (-37.89°F) and a boiling point of 356.73°C (674.1°F), which makes it the only metal that is liquid at room temperature (around 20-25°C or 68-77°F). Mercury is a very dense metal that has a high surface tension, which means that it forms droplets and is difficult to spread out. Due to its unique properties, mercury has been used in a variety of applications, such as thermometers, barometers, and electrical switches. However, it is also highly toxic and can be harmful to both humans and the environment, which has led to restrictions on its use in many countries.