0
What is the cubical coefficient of thermal expansion for metals?
Wiki User
∙ 13y ago
Since most metals are isotropic, the cubical coefficient of expansion is three times the linear coefficient of expansion.
The linear coefficient of expansion is obtained from measurement and tables for the specific material which are readily available.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
How do you calculate compression of metals if they cooled under -73 degree temperature?
Either the question is misworded, or more information is needed. Compression implies load; in order for a peice of metal to be loaded by a temperature change, it would need to be rigidly restrained by something with a different coefficient of thermal expansion. If you mean what is the dimensional change, that is answerable. It is as follows: (original size) X (coefficient of thermal expansion) X (temperature difference) = (change in length) You need to look up the coefficient of thermal expansion, and make sure you get the units right: /°C or /°F
Which material can be used as bimetallic strip?
You may use any two metals which have different thermal expansion properties. Steel and brass are commonly used because of cheapness. There is not even a need for them to be metals - you could bond two glasses of different thermal properties, and these would bend as well.
What are the characteristics of ceramics?
Physical properties means the behavior of materials in response to physical forces other than mechanical, such as; Volumetric, thermal, electric and electrochemical properties. Most Ceramics are lighter than metals but heavier than polymers. Most ceramics have a higher melting point than most metals as it is that some ceramics such as China can with stand high temperatures to about 1200 degrees centigrade. Ceramics also has lower Electrical and Thermal Conductivity than most metals but the range of value is greater in ceramics permitting some ceramics to be used as insulators, for example Porcelain insulators and others as conductors like Lithium-ion conducting glass-ceramics and oxide ceramics. Thermal expansion is another physical property of ceramics, Ceramic thermal expansion coefficients are less than those of metals but effects are more damaging in ceramics bringing about cracks and other failures(Thermal shock and thermal cracking) as for ceramic materials with relatively high thermal expansion and low thermal conductivity however there is glass ceramics that has low thermal expansion thus resisting thermal shock and thermal cracking, for example Pyrex glass ceramics. Thus the physical properties being but not limited to permeability, elasticity, considerable strength, hardness, brittleness, resistance to chemical attack and thermal shock.
What is the thermal expansion coefficient for iron oxide?
The CTE of Silica depends on it's state. Crystalline Silica has a much higher Coefficient of Thermal Expansion than fused - or glassy silica. Crystalline Silica CTE is dependent on the axis along which a single crystal in mounted. Along the z-axis CTE is as high as 12 x 10^-6 / degree C. Perpendicular to the z-axis CTE is 20 x 10^-6 / degree C (range ambient to 550C). Amorphous Silica CTE is listed as 0.55 x 10^-6 /degree C
What is the difference between positive and negative temperature coefficient of resistance?
Negative temperature coefficient of resistance means that as the temperature of a piece of wire or a strip of semiconducting material increases, the electrical resistance of that material decreases.
Would a bimetallic strip work if the two different metals happened to have the same rates of expansion?
The one with the higher coefficient of thermal expansion.
Why should the coefficient of thermal expansion of a refractory metal be the lowest?
refractory metals have high melting points and are used in extremely hot environments; if expansion coefficient is lower this prevents high stresses that can develop due to thermal gradients during the high heat up. It helps to have high thermal conductivity as well
How do you calculate compression of metals if they cooled under -73 degree temperature?
Either the question is misworded, or more information is needed. Compression implies load; in order for a peice of metal to be loaded by a temperature change, it would need to be rigidly restrained by something with a different coefficient of thermal expansion. If you mean what is the dimensional change, that is answerable. It is as follows: (original size) X (coefficient of thermal expansion) X (temperature difference) = (change in length) You need to look up the coefficient of thermal expansion, and make sure you get the units right: /°C or /°F
Solid metals undergo greater thermal expansion than liquids do?
false
At least 8 physical properties of non-metals and metals?
1. Melting point 2. Boiling point 3. Hardness (not for gases and liquids) 4. Maleability (for metals) 5. Ductility (for metals) 6. Thermall expansion coefficient 7. Density 8. Color and appearance 9. Thermal conductibility 10. Electrical conductibility
Why is a bimetallic strip curve when it is heated or cooled?
Because the two metals have different coefficient of linear expansion
Bimetallic strips composed of two different metals each having a different rate of thermal expansion are used in?
Thermostats,.
Why the bimetallic strip bent with the heat?
A bimetallic strip is made up of two metals (the prefix "bi-" means "two"). The two metals have different coefficients of thermal expansion.
What happens when the Bimetallic Strip cools down?
When the bimetallic strip cools down, the metals in the strip contract at different rates due to their varying coefficients of thermal expansion. This differential contraction causes the strip to bend, with the side of the metal with higher expansion coefficient (usually the inner layer) being on the inside of the curve.
Which metal expands the most when heated?
I image you are talking about thermal expansion, and not for example elastic expansion or other forms of expansions. If you rise the temperature, thermal expansion is represented by a coefficient for linear expansion and a coefficient for volume expansion (the two are naturally linked) that depends on temperature. At room temperature, for aluminum and steel we have linear (10^-6/°C) volume (10^-6/°C) steel 11-13 33-39 aluminum 23 69 where the coefficients for steel depends on the exact composition. Wood is not single material and different woods have very different characteristics. An increase of temperature causes in wood a much more complex phenomenon with respect to what happens in a metal crystal (it is sufficient to think that at high temperature wood can ignite). Considering only small temperature changes around 20°C however we can define thermal dilatation coefficients. However, since the dilatation is not equal in all the directions (since the material is strongly anisotropic) this coefficient depends on the direction where we measure the expansion (or compression). For oak for example, in the direction along the grain of the wood, where dilatation is maximum, the linear expansion coefficient is 54 10^-6/°C. At the end, for small temperature changes wood expands non uniformly, but generally more than metals. Among metals aluminum expands more than almost all the steel types.
What are the important thermal properties for non-ferrous metal?
The important Thermal Properties of Non-Ferrous Metals are:- 1. High Rate of Heat Transfer 2. Good Thermal Expansion 3. May be used as a High Temperature Superconductor
Which material can be used as bimetallic strip?
You may use any two metals which have different thermal expansion properties. Steel and brass are commonly used because of cheapness. There is not even a need for them to be metals - you could bond two glasses of different thermal properties, and these would bend as well.
