How hot or cold can things become?
There is no limit to how hot things can become, but if something becomes extremely cold, its atoms stop moving. It cannot get any colder. Scientists have come close to reaching this temperature, called absolute zero, at -273.16 Celsius (-459.69 Fahrenheit). Near absolute zero, matter starts to behave in strange ways. Some gases turn into metals, and some metals become 'superconductors' This means that electricity can flow through them forever, without needing any energy from outside.