Since glass has low thermal conductivity, the inside and outside of the glass does not reach an equilibrium temperature very quickly. The surface of the glass rapidly contracts while the inner surface is expanding. This causes internal stresses which cause the glass to crack.

So when a hot glass is placed in cold water it expands due to conduction of heat. But the heat doesn’t flow evenly in the glass. Hence, the expansion happens unevenly. So due to unven expansion, the glass cracks.

At What Temperature Does Glass ‘Break’? Glass bottles and jars are usually not affected by ambient, refrigeration or warm temperatures. Glass is a poor thermal conductor and rapid changes in temperature (roughly 60°F and greater) may create stress fractures in the glass that may eventually crack.

Immersing hot glassware in cold water could cause the glass to shatter.

Using Glassware Safely Do not immerse hot glassware into cold water, it may shatter.

Convection is the transfer of heat in air or a fluid through currents. An example is a pot of water warming up on a hot stove. As this occurs, the cold water sinks. So hot air rises, cools, and falls.

Transfer of heat energy through empty space. Conduction: Holding a hot cup of coffee. The heat is being conducted from your hand into the ice cube. Conduction, convection and radiation are the three ……Working hours.

Currently I have two answers: Infrared radiation from the water transfers thermal energy to the ice cube, which increases the ice cube particles KE store, breaking the intermolecular bonds of the ice cube, melting it.

Conduction is the flow of heat energy directly through a material from hot to cold. Convection is where the hot material itself moves around and carries the heat energy with it. When ice melts, heat is conducted into the solid ice but there will inevitably be convection currents in the liquid around the ice.