Of course heat is added because you are turning solid which is like ice to gas which is water vapour !!
Sublimation is an endothermic physical change (heat is needed).
Cold temperatures cause water to freeze, changing it from liquid to solid. Warm temperatures cause ice to melt, changing it from solid to liquid. Fire can heat water to its boiling point, changing it from liquid to gas. Cold air colliding with warm air in the atmosphere can cause lightning, changing it from gas to plasma.
The more heat you have the more the atoms in a substance move about. With added heat a SOILD wll change first to a LIQUID then a GAS For example Ice -> Water -> Steam Removing heat will send it through the states in the other direction. Under some conditions you might miss out a state. For instance at room temperature and under atmospheric pressure (ie in your garage!) Carbon Dioxide will go straight from solid to gas - commonly called "Dry Ice" from this reason...
To change the state of a substance, energy must be added or removed. For example, adding heat can cause a solid to melt into a liquid, while removing heat can cause a liquid to freeze into a solid. Similarly, adding energy can convert a liquid into a gas through vaporization, while cooling a gas can lead to condensation back into a liquid. This energy change typically involves changes in temperature and pressure.
Heat is a form of energy that is transferred between objects due to temperature differences. Phase changes are transitions between different states of matter, such as solid, liquid, and gas, which occur when heat is added or removed from a substance. These changes are governed by the energy exchange between molecules.
a solid → a liquid = melting (heat energy added) e.g. ice melts to water a liquid → a gas = vaporization (heat energy added) e.g. water to water vapour a solid → a gas = sublimation (heat energy added) e.g. dry ice (frozen CO2) to carbon dioxide a gas → a liquid = condensation (heat energy removed) e.g. cloud to rain a liquid → a solid = freezing (heat energy removed) e.g. water freezes to ice a gas → a solid = deposition (heat energy removed) e.g. water vapour to frost * solid-molecules tightly packed definite shape and volume(crystaline structure) * liquid-flow takes shape of container * gas-expands to fill container * plasma-electrons at 5000*C(neon lightning)
Sublimation is an endothermic physical change (heat is needed).
Cold temperatures cause water to freeze, changing it from liquid to solid. Warm temperatures cause ice to melt, changing it from solid to liquid. Fire can heat water to its boiling point, changing it from liquid to gas. Cold air colliding with warm air in the atmosphere can cause lightning, changing it from gas to plasma.
In that case, the liquid may eventually change to a gas.
The more heat you have the more the atoms in a substance move about. With added heat a SOILD wll change first to a LIQUID then a GAS For example Ice -> Water -> Steam Removing heat will send it through the states in the other direction. Under some conditions you might miss out a state. For instance at room temperature and under atmospheric pressure (ie in your garage!) Carbon Dioxide will go straight from solid to gas - commonly called "Dry Ice" from this reason...
A change of state is when a substance shifts from solid, liquid or gas to another state. This happens when heat is removed or added.
heat energy
Heat creates energy, so removing heat will slow down the movement of the molecules in the system. The molecules either go from gas -> liquid -> solid, or straight from gas ->solid.
Usually the volume changes - only a small amount for a solid or liquid, quite a lot for a gas. For an "ideal gas", the volume doubles when the temperature (absolute temperature, expressed in kelvin) doubles.
A liquid changes to a solid when heat is removed, as the molecules lose energy and come together in a more ordered structure. A solid changes to a liquid when heat is applied, causing the molecules to gain energy and break free from their fixed positions. A liquid changes to a gas when heat is added, increasing the molecular motion and allowing them to escape into the vapor phase. A solid changing directly to a gas is called sublimation and occurs when the substance bypasses the liquid phase by gaining enough energy to transition from solid to gas.
Solid --> Liquid. Liquid -> Gas. Solid --> Gas.
When matter changes state, the molecular energy generally increases as heat is added or decreases as heat is removed. Molecular motion increases as the substance transitions from a solid to a liquid to a gas. The overall mass of the substance remains the same throughout the phase change process, as no particles are added or removed.