Hint look at a hundred year old window
2006-08-20 16:26:17 · 7 answers · asked by BGS 2 in Science & Mathematics ➔ Other - Science
You're trying to imply that glass is a liquid and flows over time, but you're wrong. Glass is an amorphous solid, which means that it doesn't have a clearly defined melting point. It does have what is called a glass transition point, below which it is quite solid.
Some old windows are thicker at the bottom because the glass was made by a process that produced a thickness gradient in the sheet. Glaziers were careful to mount this glass thick edge down, for better strength.
2006-08-20 17:49:35 · answer #1 · answered by injanier 7 · 0⤊ 0⤋
Glass is an amorphous solid lacking long range order. Glass is made by rapidly cooling a melt below the glass transition temperature. Crystalline order is formed with slower cooling by a process known as nucleation and growth. For crystals to grow, atoms/molecules need to reorganize and there is an activation energy for this process. Below the glass transition temperature there is not enough energy for atoms to reorder quickly. Glass is thus in a thermodynamic metastable state. At finite temperatures, atomic reorganization does occur, so glass does not remain in a particular state. It's state evolves over time. The rate of change, however, is very low at temperatures well below the glass transition temperature.
2006-08-20 18:35:17 · answer #2 · answered by d/dx+d/dy+d/dz 6 · 2⤊ 0⤋
Glass is considered a super-cooled liquid, if we were to plot the temperature time of a substance it will hav 2 horizontal periods of time which coincides with the involvement of latent heat. since common glass has yet to reach de solid phase(by passing through the horizontal signifying latent heat of fusion), we considered it a liquid. but since it almost have a definate shape, it seems lyk a solid, in actual fact, after many yrs glasses will change shape. therefore glass is just asuper cooled liquid
2006-08-20 16:45:52 · answer #3 · answered by ThoughTs 2 · 1⤊ 1⤋
It is a very strange liquid. It will sag, with the bottom of the window becoming thicker over very long periods. But it takes years and years, which is why it can more or less be considered a solid.
2006-08-20 16:34:47 · answer #4 · answered by iandanielx 3 · 1⤊ 1⤋
It's a semi-solid
Some think it's a liquid......
2006-08-20 16:31:46 · answer #5 · answered by mnm75932 3 · 0⤊ 0⤋
solid.
2006-08-20 16:31:18 · answer #6 · answered by judy_r8 6 · 0⤊ 0⤋
fluid.
2006-08-20 16:31:51 · answer #7 · answered by Anonymous · 0⤊ 0⤋