Which is more elastic glass or rubber Why?
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Which is more elastic glass or rubber Why?
(a) Glass is more elastic than rubber because for a given applied force per unit area, the strain produced in glass is much smaller than the strain produced in rubber.
Why is glass fragile and rubber is not?
Glass is brittle because it has many microscopic cracks in it which act as seeds for a fracture. If you can make glass without these cracks, as is done in fiberglass, then it is not so fragile. Polymers that aren’t brittle are glasses with long-chain or crosslinked long-chain molecules (or mixtures).
Does glass have high elasticity?
It’s important to understand that while glass is elastic in nature on a microscopic level, it is also a very stiff material on the macroscale. This means that for typical stresses applied to glass, the resulting strain is very small.
Is rubber elastic or inelastic?
It is this constant jostling that produces a resisting (elastic) force in the chains as they are forced to become straight. While stretching a rubber sample is the most common example of elasticity, it also occurs when rubber is compressed.
Why is rubber so elastic?
Natural rubber is made of long chains of molecules called polymers. Because these polymers are so long (they can be thousands of molecules long) they get tangled up in themselves. The result is a property called elasticity, the polymers are elastic.
Why is rubber more elastic than steel?
The strain produced in rubber is much larger compared to that in steel. This means that steel has a larger value of Young’s modulus of elasticity and hence, steel has more elasticity than rubber. Rubber gets stretched because there is strain produced in it when stress is applied.
Why does glass break when heated?
Thermal fracturing in glass occurs when a sufficient temperature differential is created within glass. As a warmed area expands or a cooled area contracts, stress forces develop, potentially leading to fracture.
Why the glass break easily when it hits the ground?
It comes from the thermal stress left in the glass after it was made. As the interior cools and contracts, it pulls on the outer surface, creating a huge amount of thermal stress. Snapping the tail of the drops causes cracking that unleashes the pent-up energy, making the drop explode spectacularly.
Which is more elastic steel or rubber Why?
The ratio of stress applied on a body to the strain produced in it is defined as the Young’s modulus of that material. The strain produced in rubber is much larger compared to that in steel. This means that steel has a larger value of Young’s modulus of elasticity and hence, steel has more elasticity than rubber.
Which is more elastic iron or rubber Why?
Iron is more elastic than rubber because The elastic modulus of the more substance is more elastic.
Why does rubber stretch?
The reason rubber bands stretch is because when you pull on the rubber band, the polymers (which are normally coiled up more or less at random) get stretched lengthwise and the rubber band is lengthened. This will cause the polymers to stretch and the rubber band to lengthen.
How does elasticity change with temperature?
When the temperature of material increases, the atomic vibrations in the crystal structure also increases. So, the effect of temperature on the value of Young’s modulus of elasticity for various substances in general is that it decreases with rise in temperature.
What is elasticity of rubber?
“Rubber elasticity, identified as the capacity to sustain very large deformations followed by complete recovery, is exhibited exclusively by polymeric substances consisting predominantly of long molecular chains. Moreover, it is manifested under suitable conditions by virtually all polymers so constituted.
How does temperature affect elasticity of elastomers?
Temperature affects the elasticity of elastomers in an unusual way. When the elastomer is assumed to be in a stretched state, heating causes them to contract. Vice versa, cooling can cause expansion. This can be observed with an ordinary rubber band.
What is the thermal behavior of EPDM rubber?
The thermal behavior of an EPDM rubber mixture was measured between –125 and 160°C at 10 K/min. The glass transition was detected at –52.5°C. The melting above the glass transition (peak temperature at 31.4°C) is typical for the behavior of a sequence-type EPDM.
What happens to the temperature when rubber is stretched?
One of its most peculiar properties is a slight (but detectable) increase in temperature that occurs when a sample of rubber is stretched. If it is allowed to quickly retract, an equal amount of cooling is observed.