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1.A block of ice is solid water. When heat (a form of energy) is added, the ice melts into liquid water. It has reached its melting point – 0°C. Continue to apply heat, and the water will turn into water vapour, which is water in its gaseous state.
2. Heating a gas increases the kinetic energy of the particles, causing the gas to expand
Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid
3.The particles of matter in the solid state are close together and fixed in place. ... The gas expands to fill its container. Thus, a given number of particles will have the greatest volume in the gas state.