Revision: Term - 3 >> Air Science SSLC (English Medium) Class 5 Tamil Nadu Board of Secondary Education

Rusting: Slow conversion of iron into its hydrated oxide in the presence of moisture and air is called rusting.

Respiration: Respiration is a chemical process that takes place in all living beings (slow in plants). In this process, oxygen present in inhaled air reacts with the digested food material in the body. This results in the release of energy, carbon dioxide, and water.

Sugar + Oxygen → CO2 + Water + Energy.

The envelope of air around the Earth is called the atmosphere. It is composed of nitrogen, oxygen, water vapour, and carbon dioxide, with other gases present in small quantities. The atmosphere is like a protective blanket that keeps our planet safe and helps support life.