highly viscous; cools quickly
Because they make the glass less likely to break during extremes in temperature.
A piece of crystal stemware has a natural or resonant frequency that can be excited by rubbing a moistened finger along its rim. Filling the glass with water merely changes the pitch of the tone. The tone you hear is created when the crystal vibrates at frequencies in the audible range for humans. Although it's difficult to see, the glass actually flexes during the vibrations. If the glass deforms sufficiently, it can break, since crystal is brittle and not very elastic. It is not likely that a flawless glass could be made to break merely by rubbing its rim. The MythBusters demonstrated the resonance of a crystal glass and shattered several by exciting the glasses with a human voice. One professional singer broke a glass without the use of amplification. See the video.
Pyrex glass is less likely to crack when subjected to rapid temperature changes because it is made with borosilicate glass, which has a higher thermal shock resistance compared to regular glass. The composition of borosilicate glass allows it to handle quick temperature changes without breaking due to its low coefficient of thermal expansion.
Yes, Obsidian is known as volcanic glass. It is a natural glass formed from rapidly cooled lava, typically from volcanoes. Obsidian has a shiny appearance and is commonly used in jewelry and tools due to its sharp edges when fractured.
The angle of refraction in the glass is likely to be less than 45 degrees since light bends towards the normal when it passes from a less dense medium (air) to a denser medium (glass). The exact angle of refraction can be calculated using Snell's Law: n₁sinθ₁ = n₂sinθ₂, where n₁ and n₂ are the refractive indices of air and glass, respectively.
sand and glass mixture
Obsidian is a natural glass.
some natural forces can cause glass to break
Glass is formed from sand or silica.
usually a tall, slender, sexually attractive female...appealing to some males...if not all males. she'll quench your thirst, alright.
A nice cool glass of apple cider, iced tea, or lemonade. And don't forget the ice cubes! :)
Natural fibre
The natural frequency of glass is the frequency at which it vibrates when disturbed. When glass is exposed to vibrations at its natural frequency, it can lead to resonance, causing it to shatter. This can compromise the structural integrity of the glass, making it more prone to breakage.
A diamond will cut glass.
The diamond, being one of the hardest natural materials, will likely scratch the glass surface due to its superior hardness. Conversely, the glass would not be able to scratch the diamond due to the diamond's hardness.
glass bends light
obsidian