Two major characteristics that change when air is heated and cooled is the density and the direction of the air flow. They change the movement of the air by heated air rises and cooled air doesn't.
Answer: The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close because the kinetic energy of the particles of matter increases with the increase in temperature. In cold foods, kinetic energy is less while in hot foods, kinetic energy is more
hope this helps
Answer:
Gastric juice is an acidic substance ( Strongly acidic)
Explanation:
According to the table shown in the question:
- Gastric juice turns blue litmus paper to red
- It is neutral to red litmus
Note: Any substance that turns blue litmus paper red and is neutral to red litmus paper is an acidic substance.
Moreover, gastric juice is a combination of Pepsin and HCl and it has a PH that varies between 1 and 3. This PH is typical of a strongly acidic substance.