Why is ice molecule melts in room temperature
The room temperature is warmer than the ice. The heat energy that melts the ice comes from the temperature surrounding the ice. An ice cube has a temperature less than 32 degrees. The temperature of the air in a room is approximately at 68 degrees. Heat looks to equalise areas of lesser energy due to the motion of the molecules. When the faster moving molecules come into force with slower moving molecules they impart some energy to them thereby melting the ice.