Sample Complete Student Response: The aluminum’s temperature changed less than the copper’s did under the same conditions. Thus, the aluminum must require more energy to change its temperature. Therefore, aluminum has the higher specific heat.
Q. Which liquid expands least on heating?
It is normal experience that substances expand on heating and contract on cooling. But for water, this is never to be between the temperatures 00C and 40C. Water can exist as a solid (ice), liquid (liquid water) and as a gas (steam)….THERMAL EXPANSION.
Table of Contents
- Q. Which liquid expands least on heating?
- Q. Do any materials shrink when heated?
- Q. Which metal expands more for the same rise in temperature aluminum or copper?
- Q. When a bar of parallel strip of steel and copper is heated then?
- Q. What two metals are often used to make a bimetallic strip?
- Q. Which metal expands more in a bimetallic strip?
- Q. Why is a bimetallic strip made of steel and copper is bent as shown in the figure on heating?
- Q. Why is Invar used in bimetallic strips?
- Q. What material is used for bimetallic strip in irons?
- Q. What is the radius of bimetallic strip?
- Q. When a bimetallic is heated the strip will bend toward the side?
- Q. What is bimetallic thermometer?
| Mercury | Alcohol |
|---|---|
| Easily visible | Ii coloured to make it easily visible |
Q. Do any materials shrink when heated?
Most materials expand when heated, but a few contract. A few of the known shrinking materials, however, have unique crystal structures that cause them to contract when heated, a property called negative thermal expansion.
Q. Which metal expands more for the same rise in temperature aluminum or copper?
A Aluminium expands more than copper.
Q. When a bar of parallel strip of steel and copper is heated then?
The copper has thermal expansion coefficient value 17×10−5/oC and iron 12×10−5/oC. When heated copper expands more than iron, so the strip is bended into the iron’s way.
Q. What two metals are often used to make a bimetallic strip?
Characteristics. The strip consists of two strips of different metals which expand at different rates as they are heated, usually steel and copper, or in some cases steel and brass.
Q. Which metal expands more in a bimetallic strip?
brass
Q. Why is a bimetallic strip made of steel and copper is bent as shown in the figure on heating?
bi-metalic strips bend when heated Two metals making up the strip have different rates of expansion, so as heat is applied and the metals expand, one metal will expand faster than the other, causing that side to grow longer faster than the other side.
Q. Why is Invar used in bimetallic strips?
Invar is used for bimetallic strips for controllers which capitalises on the effect of two different metals with different coefficients of linear expansion causing movement at set temperatures. A bimetallic strip metal is made by laminating two metals together which have different rates of expansion.
Q. What material is used for bimetallic strip in irons?
A bimetallic strip controls the thermostat. This consists of a strip of brass in contact with a strip of iron. At normal room temperature, the two strips have the same length.
Q. What is the radius of bimetallic strip?
R is the radius of curvature of the bimetallic strip to the bimetallic joint center line (mm). This is a first order estimate of the radius of curvature of the strip as a function of change in temperature that approximates to the Timoshenko formula, see Fig. 2. The simple derivation resulting in eqn.
Q. When a bimetallic is heated the strip will bend toward the side?
When the temperature is decreased the metal low coefficient of thermal expansion will bend towards the other. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. Thus they bend towards the metal having a lower thermal expansion.
Q. What is bimetallic thermometer?
A bimetallic thermometer is a temperature measurement device. It converts the media’s temperature into mechanical displacement using a bimetallic strip. The bimetallic strip consists of two different metals having different coefficients of thermal expansion.
