5.1 Glasshouses

• Glass houses are made of glass to let as much sunlight in as possible
• Solar radiation is the source of energy (from light)
• Light goes through the glass and is absorbed by the surface inside the glass house (soil, plants etc.)
• Plants re-emit the heat thus causing warm air and causing increase in temperature
• High temperature enables plants to increase yields to certain crops. 
• Such as constant temp. per year, prevention of frost damage and prevention of loss of water vapor