heat energy and changes of state. matter may exist as a solid, liquid, or a gas
TRANSCRIPT
Heat Energy and
Changes of State
• Matter may exist as a solid, liquid, or a gas.
Changes of State• An increase or decrease in energy and temperature
of matter can cause the matter to go from one state to another.
• Melting: solid changes to a liquid
Changes of State• Solidification: liquid
changes to a solid
Changes of State• Evaporation: liquid changes to a gas
Changes of State• Condensation: gas changes
to a liquid
Changes of State• Sublimation: – Solid to a gas– Gas to a solid
As seen in the side-by-side images above, water ice in a trench
on Mars is sublimating in the
cold, thin air over the course of four
Martian days (sols).
These images show the Martian north pole throughout changing seasons on Mars. Increased warming as spring progresses in the northern hemisphere has sublimated the carbon dioxide ice and frost below 70 degrees north latitude.
Frost occurs when water vapor in the air changes directly into a solid.
Stored Heat and Changes in State
• The temperature remains constant while water is changing state.– The heat being added during a phase change is being
changed into stored heat
