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Thermal Conductivity.

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Introduction

Sunday 6th October Thermal Conductivity Write Up Introduction For the good thermal conductor we will have to identify which of the four sample materials is the best thermal conductor in the experiment. The experiment will test how long it will take the specific sample material to heat which will be discovered by a nail with jelly on it, it will be stuck on the opposite end to which is being heated. When the nail falls off the time will be stopped we'll do this three times for accurateness and take the overall average. The four sample materials we will use are: * Copper * Brass * Glass * Mild-steel For the good insulator we will identify which of the two materials is the best thermal insulator (something that is not able to conduct thermal energy), we will discover this by surrounding one copper breaker in cotton wool and another in felt. Then put boiling water in each then watch and record the temperature every minute for twenty minutes. The breaker that drops in temperature the quickest is the best insulator and the worst conductor of thermal energy. Safety Point 1. Do not muck around. 2. Remove blazer and tuck in tie. 3. Do not touch sample material after its been under the flame. 4. ...read more.

Middle

Yet the strengths were the certainly concentration was a big strength but the best strength of all was teamwork and that no mistakes were blamed on a single it was a group responsibility. I wouldn't really drastically changed my experiment layout not many problems occurred during the whole experiment, so I would only tactical one area of the experiment that's the glitch with the glass, but theoretically that wasn't are fault and so I would have to consult a Scientific based teacher. Section 2 Good Insulators Hypothesis Insulators are materials that can be heated, but don't sustain any of the provided by the boiled water in the copper breaker with all this information; my thoughts lead me to believe * That felt will be the material that will lose the heat faster. * Initially cotton wool will be the fastest to lose heat. Method 1. Collect two copper breakers, some felt and cotton wool, lids for each of the breakers, two thermometers, stopwatch and a kettle with water in it. 2. Surround one of copper breakers in cotton wool and the other in felt. 3. Boil the kettle and pour the boiling water in to each of the copper breakers and put the lids on. ...read more.

Conclusion

High temperature thermophysical properties, e.g. thermal conductivity, diffusivity, emissivity, specific heat and expansivity, are vital to the engineering and materials processing sectors, indeed, to all industries that depend on materials behaviour at elevated temperatures. The diffusivity standard provides measurement traceability over a large range of property values, material types and temperatures (which is often convenient for precious or small material samples), it supports the top level conductivity standard in extending the temperature range above 1000 & degrees, and it allows thermal performance evaluation during transient heat-flow. These thermal conductivity standards extend NMS capability to cover, for example, metals, alloys, ceramics, polymers and so on, the 'bedrock' engineering materials. Emissivity is one of the most important thermophysical properties, affecting all high temperature industries. Emissivity data is vital for modelling thermal radiant heat transfer or for non-contact temperature measurement with pyrometers and radiation thermometers, for example where remote temperature measurement or monitoring is required. This theme also covers the development of standards for newly emerging trends, including the requirement for the measurement of thermal diffusivity and emissivity of molten metals, the thermal conductivity of powders, sludges and slurries and the need for qualified thermophysical property data of key industrial materials. The main technical objectives of the 'Thermophysical Properties' projects are described briefly below. ...read more.

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