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.
The coeifficent of expansion per degree can be found in the manufacturers charts
Brass is a metal alloy
Gold, definitely. How about fixing this question as to what type of "brass" There is Yellow brass 60% Copper 40% Zinc and the more common red brass 85% copper and 15% Zinc then there is Muntz metal and Bronze thus BRASS = COPPER as there is NO gold content in "Brass"
Brass is shiny under certain conditions. If the brass is polished or cleaned the right way it will result in a shiny appearance.
No, the brass rod could be expanding or contracting due to changes in temperature, but it does not necessarily mean that brass shrinks on heating. Temperature changes can cause thermal expansion or contraction in materials, including brass. To determine if brass specifically shrinks on heating, a controlled experiment measuring thermal expansion coefficients would be needed.
The order of expansion rate from lowest to highest is: copper, brass, iron, aluminium. Copper and brass have relatively low thermal expansion coefficients, while aluminium and iron have higher coefficients.
When heated, a bimetallic strip made of iron and brass will bend towards the brass side due to the different coefficients of thermal expansion of the two metals. This is because brass expands more than iron when heated, causing the strip to curve towards the side with greater expansion.
Brass and iron have different coefficients of thermal expansion, so when exposed to a change in temperature, they would expand by different amounts. This difference in expansion causes the bimetallic strip to bend due to the unequal expansion of the two metals.
assuming it is pure copper and not an alloy, 17(k), 9.3 Co
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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.
Generally it should be made from brass
An example; if the metal bar, made up of 2 steel and brass strips, is heated the strips will also heat up. Each material’s coefficient of thermal expansion varies, which indicates how much a material is affected by heat. :Steel has lesser coefficient of thermal expansion than brass. While warming the bar, the brass strip elongates more than the steel strip because of a higher coefficient of its thermal expansion. When the two strips are attached one next to another, the expansion at the two ends differs and this bends the bar. The brass strip expands more than the steel strip will hence exert force on the steel strip and expands it outwards. This creates a bend in the bar, the brass strip moves out more than the steel strip as shown in Fig. When the bar will be cold, strips will also contract and bar will go back to the first position and so on. However, heating and bending the bar can cause significant stresses in the material including deformations that can lead to prolonged changes within the properties of the material and failure over time.
A bimetallic strip is typically made up of two different metals bonded together with different coefficients of thermal expansion. Common combinations include brass and steel or copper and steel. When exposed to temperature changes, these metals expand at different rates, causing the strip to bend.
Aluminium bronze expands at a quicker rate than aluminium due to its higher thermal expansion coefficient. Aluminium bronze is a copper-based alloy that contains aluminium, which makes it expand more with heat compared to pure aluminium.