The reason why water and ice cubes don't melt inside a freezer, despite the temperature inside being below zero degrees Celsius, is because the freezer is designed to maintain a temperature below the freezing point of water.
The freezing point of water is 0 degrees Celsius (32 degrees Fahrenheit) at normal atmospheric pressure. However, the temperature inside a freezer is typically set lower than this, usually around -18 degrees Celsius (0 degrees Fahrenheit) or lower. This low temperature prevents the ice cubes from melting.
When the temperature is below the freezing point, the water molecules lose energy and slow down, reducing their kinetic energy. As a result, the water molecules are not able to overcome the forces of attraction between them and transition into a liquid state. Instead, they remain in a solid state as ice.
It's important to note that the temperature inside a freezer may fluctuate slightly to maintain the desired temperature range. However, the overall temperature remains below the freezing point of water, ensuring that the ice cubes do not melt.