Key Idea.
Section 1
Titan's Summer Energy
Data from the moon Titan reveals a seasonal shift. As "summer" arrives, the methane lakes receive more direct sunlight. This sunlight represents a massive input of thermal energy.
Just as the sun heats Earth's oceans, this solar energy is transferred to the liquid methane molecules, increasing their temperature and average kinetic energy.
Section 2
The Mechanism of Evaporation
Evaporation occurs when molecules in a liquid gain enough speed to escape. On Titan, the added solar energy boosts the kinetic energy of the methane molecules.
Eventually, individual molecules move fast enough to break away from the liquid's surface and enter the atmosphere as gas. This process explains the mystery of the disappearing lake: the liquid turned into vapor.
Expand to review the lesson summary and core properties.
Section 1
Titan's Summer Energy
Data from the moon Titan reveals a seasonal shift. As "summer" arrives, the methane lakes receive more direct sunlight. This sunlight represents a massive input of thermal energy.
Just as the sun heats Earth's oceans, this solar energy is transferred to the liquid methane molecules, increasing their temperature and average kinetic energy.
Section 2
The Mechanism of Evaporation
Evaporation occurs when molecules in a liquid gain enough speed to escape. On Titan, the added solar energy boosts the kinetic energy of the methane molecules.
Eventually, individual molecules move fast enough to break away from the liquid's surface and enter the atmosphere as gas. This process explains the mystery of the disappearing lake: the liquid turned into vapor.