When thermal energy is applied to an ice cube, it causes the ice cube to absorb the heat and increase in temperature. As the ice cube warms up, the ice starts to melt and eventually turns into water. This process is known as melting. The ice cube's molecules gain energy from the heat, causing them to move faster and break the bonds that hold them together in a solid state. The temperature of the ice cube will continue to rise until it reaches the melting point of ice, which is 0 degrees Celsius (32 degrees Fahrenheit). At this point, the ice cube will have completely melted into water.
