Question

in which conversion H2O molecules lose speed?

Answer 1

When water goes changes from a gas to a liquid, or a liquid to a solid, the water molecules have lower kinetic energy, and therefore they lose speed.

Water molecules loose speed when frozen to ice.

When the temperature. drops the energy level or molecule movement, slows down.

When frozen, the water molecules start begin to stop moving.

Answer 2

In case of steam- ice,H2O molecules lose speed. Steam molecules lose heat energy and kinetic energy. They become more slower and closer to each other to condense to give water and continue to lose kinetic energy; until they vibrate in fixed positions when water freezes to form ice.