What is a greenhouse?
A greenhouse is also called a glasshouse or a hothouse. It is a structure where plants – fruits, vegetables, flowers – are grown. It attracts heat because the sun’s electromagnetic radiation warms the plants, soil, and other components within the greenhouse. Air is warmed from the hot interior area inside the structure through the roof and wall.
How does a greenhouse capture heat?
A greenhouse uses a special kind of glass that acts as a medium which selectively transmits spectral frequencies. Spectral comes from the word “spectrum”.
In layman’s terms, a spectral frequency can be defined in terms of the following principle: any object in the universe emits, radiates or transmits light. The distribution of this light along an electromagnetic spectrum is determined by the object’s composition.
Therefore, the glass of a greenhouse traps energy within the greenhouse and the heat in turn provides heat for the plants and the ground inside the greenhouse. It warms the air near the ground, preventing it from rising and leaving the confines of the structure.
Read more on the E-Book: Growing Greenhouses