Window glass of old building is thick at bottom. Give reason.
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this may help you - There is still much about the molecular physics and thermodynamics of glass that is not well understood, but we can give a general account of what is thought to be the case.
Many solids have a crystalline structure on microscopic scales. The molecules are arranged in a regular lattice. As the solid is heated the molecules vibrate about their position in the lattice until, at the melting point, the crystal breaks down and the molecules start to flow. There is a sharp distinction between the solid and the liquid state, that is separated by a first order phase transition, i.e. a discontinuous change in the properties of the material such as density. Freezing is marked by a release of heat known as the heat of fusion.
Many solids have a crystalline structure on microscopic scales. The molecules are arranged in a regular lattice. As the solid is heated the molecules vibrate about their position in the lattice until, at the melting point, the crystal breaks down and the molecules start to flow. There is a sharp distinction between the solid and the liquid state, that is separated by a first order phase transition, i.e. a discontinuous change in the properties of the material such as density. Freezing is marked by a release of heat known as the heat of fusion.
Anonymous:
Thank you for your long answer but I need a short answer of that question....it's a 2 mark question..
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14
Glasses in the windows of old buildings are found to be thicker at the bottom because of the manufacturing process of glass used at that time.
Earlier process of manufacturing glass involved spinning molten glass into a hollow globe. This was later flattened by reheating and centrifugal force. So, the glass so manufactured was thinner at the outer edge but became progressively thicker as we moved to the center i.e. the glass produced was not complete flat.
This glass was then cut into desired size and shape. Thicker edge of the glass was kept at the bottom of windows attain more stability of the windows.
Earlier process of manufacturing glass involved spinning molten glass into a hollow globe. This was later flattened by reheating and centrifugal force. So, the glass so manufactured was thinner at the outer edge but became progressively thicker as we moved to the center i.e. the glass produced was not complete flat.
This glass was then cut into desired size and shape. Thicker edge of the glass was kept at the bottom of windows attain more stability of the windows.
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