If you put a glass with ice cubes in the freezer, several things will happen. Here's what you can expect:
Cooling down: The ice cubes in the glass will begin to cool down rapidly as the freezer is much colder than room temperature. The ice will absorb the heat from the surrounding air and other objects in the freezer.
Melting and Re-Freezing: While it may seem counterintuitive, the ice cubes may start to melt slightly on the surface. This occurs because the outermost layer of the ice cubes comes into contact with the relatively warmer air inside the freezer. However, as the melted water drips down, it will re-freeze due to the low freezer temperature, creating a thin layer of ice on the outer surface of the cubes.
Equilibrium: After some time, the ice cubes will reach a new equilibrium temperature inside the freezer, and their melting and re-freezing processes will stabilize.
Chilling the Glass: The glass itself will also cool down due to the cold temperature inside the freezer and the ice cubes in it.
It's worth noting that the time it takes for the ice cubes to reach equilibrium and the glass to cool down depends on various factors, such as the size of the ice cubes, the initial temperature of the glass and its surroundings, the temperature of the freezer, and the insulation properties of the glass.
It's generally safe to put a glass in the freezer with ice cubes, but it's essential to be cautious when removing the glass afterward, as it will be very cold and might cause discomfort if touched with bare hands. Always use oven mitts or a towel to handle the cold glass.