Question

please give me the observation and conclusion of the thermal conductivity of metals and nonmetals​

Answer 1

Answer:

The goal of this experiment is to demonstrate the effect which varying thermal conductivities have on the heat flow through a given material. Ultimately this will provide a better understanding of both thermal conductivity and thermal resistance

BACKGROUND INFORMATION AND EQUATIONS

BACKGROUND INFORMATION

Thermal Conductivity is a measure of a materials ability to transfer heat through itself and is one of the 3 variables in Thermal resistance. Thermal Resistance is analogous to Electrical Resistance in that it is inversely proportional to the flow of heat. In a laboratory setting, thermal resistance is calculated under specific circumstances allowing for thermal conductivity to then be derived from the obtained results.

Heat Flow Equation Q = ΔT / RΘ

Q = Heat flow in Watts

ΔT = Temperature difference in Degrees Celsius

RΘ = Thermal Resistance (l / k ⋅ A)

l = Length of a material in Meters

k = Thermal conductivity constant in W/m-K

A = Surface area in meters squared

This experiment will vary the bolded constant via different samples.

This experiment was designed to compare thermal conductivities thus surface area, length and temperature difference must remain the same in every test. One may use non-metals for this experiment however, may run the risk of lengthy testing time or potential incompletion. It is therefore suggested that metals be used. A listing of common metals may be found in the comparison section.

MATERIALS

Material Price Location of Purchase

Wiring (Same Diameter, 1.1m)

•Copper

•Aluminum

•Steel Between 5-10$ each, 15-30$ total. Amazon

Candles x15 1$ Amazon

Infrared Thermometer 23$ Amazon

Beaker x2 (50ml) 3$ Indigo Instruments

Ruler 2$ Amazon

Hot Plate 15$ Amazon

Stop Watch 4$ Amazon

Total 63-78$

PROCEDURE

Obtain two beakers (similar or different size), fill one with water and place it on the hot plate.

Place the other beaker on object of similar size to the hotplate as to make the lips of both beakers at the same height (or use a taller beaker)

Bend all the wires 90° on both ends creating 50mm arms and ensure that 1m of straight wire is maintained

Ensure that the bent end of the wire is immersed in the water

Place all three wires of choice on the lips of both beakers as to connect both beakers