The glass panel used in greenhouses is known to retain ________.

The correct answer is heat.

Key Points

• The glass panels in greenhouses are specifically designed to retain heat through a process called the greenhouse effect, which helps maintain a warm environment for plant growth.
• These panels allow sunlight to pass through but trap the infrared radiation (heat) emitted by objects inside the greenhouse, preventing it from escaping.
• The retained heat creates a controlled microclimate suitable for cultivating plants, especially in colder regions or during off-seasons.
• Greenhouse glass is often treated or coated to enhance its thermal efficiency and minimize heat loss.
• This mechanism is crucial for growing plants that require consistent warmth, such as tropical or subtropical species, in temperate climates.

Additional Information

• Greenhouse Effect: This is the process by which glass panels trap heat inside the greenhouse, creating a warm and stable growing environment.
• Infrared Radiation: When sunlight enters the greenhouse, it is absorbed by plants and surfaces, which then emit infrared radiation. The glass prevents this radiation from escaping.
• Humidity Management: Greenhouses also help regulate humidity levels, but their primary function is to retain heat for optimal plant growth.
• Thermal Glass Coatings: Modern greenhouses often use glass with special coatings to enhance insulation and reduce energy loss.
• Temperature Control: Additional tools like ventilation systems, heaters, and shading devices are often used to maintain the desired temperature within the greenhouse.