Question

3. When the metal lid of a glass bottle is too tight to be opened, the lid is immersed in hot water
Why do you think this is done?​

Answer 1

Answer:

The metal lid expands at a faster rate than the glass jar, which forms a gap between the metal lid and the glass jar. This gap grows as the metal lid expands, until the lid pops open from the jar.

Use a dish towel. Use a knife. Bang it on the counter. Use your hands!  The Internet is full of tips on how to open a stubborn glass jar with a metal lid. However, a little science and some hot water can save you the effort of doing anything  special at all. The lid just pops open. Voila!

Thermal expansion is what happens when you run a jar under hot water. But how does the process work?

Thermal Expansion

Most materials expand at high temperatures and contract at low temperatures. The phenomenon by which materials expand when exposed to heat is known as thermal expansion.

Inside the material

All materials are composed of basic building blocks known as atoms. Millions of atoms make up a molecule, and a material is made up of many such molecules. In solids, these molecules are arranged in a specific pattern, known as a crystal structure. They are held tightly together within the structure as a result of strong attractive forces, known as intermolecular forces of attraction. Within the crystal structure, the molecules are continuously vibrating within their fixed positions.

Effect of heating

Heat is the internal energy that is transferred from a body at a high temperature to a body at a low temperature. This process is also known as thermal energy transfer. When a material is heated, or receives heat from a source like hot water, the molecules in the material absorb this thermal energy.

The thermal energy does to the molecules what caffeine does to humans – it gives them an energetic boost. The molecules, which were previously just vibrating about their fixed positions, will now start bouncing up and down with this additional energy. Thus, every molecule now takes up more space than it did before to accommodate these energetic vibrations, which causes the material to expand.

Effect of crystal structure

Metals have an organized crystal structure, meaning that the atoms and molecules in metals occupy specific positions. The heat therefore gets distributed more evenly over the entire material, allowing it to expand at a uniform rate. On the other hand, glass is brittle. The crystal structure in glass consists of a number of small pockets of atoms and molecules arranged very randomly. This disorganized arrangement is known as an amorphous structure and acts like an obstacle course that prevents heat energy from being distributed evenly across the material.

Explanation:

Answer 2

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HERE`S YOUR ANSWER :-

A tight metal lid of a glass jar can be opened when dipped in warm water because when we dip the lid which is made of metal becomes soft and we are able to remove it quickly without much force.

thanks

by= Aryan Saxena