0
The reason is because glass is heated up sand, wheras metal is an ore, so when u heat u glass, it attempts to become its origonal state :)
answer 2 Glass is a poor conductor of heat, but will expand upon heating. The combination of these two things means that if glass is heated quickly, it will develop stresses and may crack.
The glass used on stove tops is special glass with a low coefficient of expansion, so one of the danger factors above is missing.
Glass used as laboratory ware is often very thin, or made glass with a low coefficient of expansion.
Another technique used to make glass more heat-resistant (e.g. cups and pans) is to pre-stress it (tempered glass) so that the surface is under compression, and thus resistant to cracking.
Metal on the other hand, is not usually subject to brittle fracture, and it is usually a good conductor of heat.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoI believe that the (if your talking about holding a match or burner to it) glass doesn't 'spread out' the heat, the thing I mean with this is that the glass will just heat up meanly in one spot causing it to expand only in that spot and since glass isn't really flexible it cracks. Most of the metals on the other hand are flexible and spread out the heat energy much better causing it not meanly to expand in one place.
regards,
Add your answer:
Earn +20 pts
When the metal ball is heated can it go through the metal ring?
when the ball is heated, it will pass through the unheated ring.
How does snow turn into condensation?
The snow would have to be heated to become water, then boiled to become a gas. This gas would then collect on a cooler material (glass, plastic, metal, etc) and condense.
When a metal powder is heated in open dish it turns black which metal is that?
The metal might be copper. When copper is heated, it reacts with oxygen in air forming copper oxide which is black in colour.
Name one metal which does not react with oxygen when heated?
Brooks metal ;)
What happens to the particles in a metal when the metal is heated?
When a metal bar is heated....the particles in the area of the metal bar that is hot start vibrating.. knocking into each other and passing the heat energy on to cooler particles. The cooler end that isn't heated still has a rise in temperature just not as much as the heated area because the heat has almost been diluted.
Why a glass jar can be easily opened if the metal lid is heated?
because metal will expand when it has been heated up
How are Kazoos made?
Plastic - injection mold. Metal, sheet metal presses, wood - hand carved. Glass - tubes as heated and altered in a glass blowing method.
Why a glass jar can open easily if the metal lid is heated gently first?
Heat causes the metal to expand, thus breaking the seal.
What is aneling?
i think its "annealing"... if so, it is a process where both metal and glass are heated in order for them to change their/its properties.
Why an empty glass cracks when you pour very hot water into it but it does not crack if there is a metal spoon in it?
As the metal spoon is a good conductor of heat and because heat travels from a hotter reigion to a colder reigion,the metal spoon will conduct heat away from the hot water and thus,the emty glass will not crack.
Will the volume of metal decrease if it is heated?
No, the volume of a metal increases as it is heated. It expands.
Why is a tightened lid on jar easier to remove when heated?
Because the metal lid expands quicker than the glass jar - making it loose.
Why do train tracks expand?
Metal expands when it is heated. Since track is made of metal then it expands when it is heated by the sun.
When the metal ball is heated can it go through the metal ring?
when the ball is heated, it will pass through the unheated ring.
What glue bonds glass to metal?
An epoxy will bond glass to metal.
An empty glass cracks when you pour very hot water into it but it does not crack if there is a metal spoon in it?
The metal spoon has the capacity to absorb some of the heat of the very hot water, but not very much. It only makes a small difference.the crcking cracking crack
why laboratory apparatus have different kinds of materials such as woods, glass, rubber and metal?
The laboratory apparatus have different materials because of different types of experience... If you look at a beaker or text tube, it definitely have to be glass why? So that you can see the reaction through the glass and when heated it will not melt in the case of making them plastic. The metal in stands is because metal is more firm and can be easily adjusted unlike wood which can not be use for metallic functions.
