Fill In the Blanks:
1.The physical significance of ....... is that it tells us how fast heat is propogated or it diffuses through a material during changes of temperature with time.
2. According to Krichoff's law in thermal equilibrium absorptivity is equal to ........
3.In conduction heat transfers from...... temperature to low temperature.
4.In providing critical radius of insulation ....... & ........ are having significant importance.
5.Radiations are ....... waves.
Dhilsath,
I have some friendly advice for you.
The pattern of your posts appears that you are downloading your homework assignments here. We do not see efforts on your part to solve the problems, not even to understand the material given the fact that multiple questions on the same subject have been submitted.
I have the impression that if you continue to "learn" in this manner, you will not stay in your program for very much longer.
Please try to purchase or borrow a textbook and start reading. I hope it is not too late to salvage this term.
2.Emissivity
3.high
5.Electromagnetic
Correct.
1.diffusion
plz answer the above fill in the blanks. quickly
No answer
1. The physical significance of thermal diffusivity is that it tells us how fast heat is propagated or diffuses through a material during changes of temperature with time.
To determine the thermal diffusivity of a material, you can use the formula:
Thermal Diffusivity = Thermal Conductivity / (Density * Specific Heat Capacity)
You will need to measure or find the values for thermal conductivity, density, and specific heat capacity of the material in question. Once you have these values, you can substitute them into the formula to calculate the thermal diffusivity.
2. According to Kirchhoff's law in thermal equilibrium, absorptivity is equal to emissivity.
Kirchhoff's law states that at thermal equilibrium, the absorptivity (the ability of a material to absorb radiation) is equal to the emissivity (the ability of a material to emit radiation). This law applies to both real and idealized materials.
3. In conduction, heat transfers from high temperature to low temperature.
Conduction is one of the three main mechanisms of heat transfer, along with convection and radiation. It occurs in solids and stationary fluids. In conduction, heat is transferred through direct contact between particles or molecules of a material. Heat naturally flows from regions of higher temperature to regions of lower temperature due to molecular vibrations and collisions.
4. In providing critical radius of insulation, temperature difference and thermal conductivity are having significant importance.
The critical radius of insulation refers to the minimum radius at which an added insulation layer becomes effective in reducing heat transfer. Insulation is commonly used to minimize heat loss or gain in various applications such as buildings, pipelines, or industrial processes.
To determine the critical radius of insulation, you need to consider the temperature difference across the insulation layer and the thermal conductivity of the material being insulated. The temperature difference represents the driving force for heat transfer, while the thermal conductivity describes the material's ability to conduct heat. By evaluating these factors, you can determine the critical radius at which the insulation will significantly reduce heat transfer.
5. Radiations are electromagnetic waves.
Radiation refers to the transfer of heat energy through electromagnetic waves. Unlike conduction and convection, which require direct contact or a medium for heat transfer, radiation can occur through vacuum or any transparent medium. Radiations include various forms of electromagnetic waves such as infrared, visible light, ultraviolet, X-rays, and radio waves.