Q.2 Why thin peel of onion is placed in a watch glass containing water?
Answers
Answer:
There are a number of factors involved in this question. A piece of thick glass placed in hot water will have the external surface heated and hence try to expand while the internal surface is not heated creating both tension and compression forces in different areas. Glass is strong in compression but not strong in tension so there is a dynamic that is resolved by the thickness and hence strength of the glass.
Thin glass is weaker, but also more flexible and the stresses created by the hot water can cause the glass to bend (ever so slightly) to relieve the pressures on it.
The bottom line is that the stronger thick glass experiences greater forces than the thinner and weaker glass. Whether the glass does, or does not, crack depends on the temperature differential, the thickness of the glass, it's Young's modulus, tensile strength, presence-or absence- of stress risers and some other even less quantifiable properties.
Answer:
because: It prevents the peel from folding. It prevents the peel from drying.
Explanation:
because: It prevents the peel from folding. It prevents the peel from drying.