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Chapter 12: Problem 33

Which of the following properties are suitable for a cooking utensil? (a) High specific heat (b) Low specilic heat (c) High conductivity (d) Low conductivity

Short Answer

Expert verified
(b) Low specific heat, (c) High conductivity

Step by step solution

01

Understanding Specific Heat

Specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. High specific heat means the substance can absorb a lot of heat without a significant increase in temperature, while low specific heat indicates the opposite.
02

Analyzing Thermal Conductivity

Conductivity refers to a material's ability to conduct heat. High thermal conductivity means heat travels quickly through the material, while low conductivity implies slower heat transfer.
03

Applying to Cooking Utensils

A good cooking utensil should heat up quickly and distribute heat evenly. For this, low specific heat is preferred as it heats up quickly. High conductivity is beneficial to spread heat quickly and evenly across the surface.
04

Choosing Appropriate Properties

Based on the understanding of specific heat and conductivity, the suitable properties for a cooking utensil are low specific heat and high conductivity. This ensures that the utensil heats up quickly and effectively.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Specific Heat
In the context of thermal properties, specific heat represents the amount of heat energy required to raise the temperature of a unit mass of a substance by one degree Celsius. This characteristic can vary widely between materials.
High specific heat materials absorb large amounts of heat but reflect this in only small increases in temperature; essentially, they can take in a lot of heat without significant warming.
In contrast, materials with low specific heat promptly increase in temperature when exposed to heat. For cooking utensils, a low specific heat is advantageous because it allows the utensil to heat up quickly when placed on a stove or heat source. This efficiency allows for faster cooking, saving both time and energy.
  • High Specific Heat: Absorbs lots of heat, slow to warm up
  • Low Specific Heat: Heats up quickly, efficient for cooking
Analyzing Thermal Conductivity
Thermal conductivity measures a material's ability to conduct heat. It indicates how quickly heat passes through a material. High thermal conductivity means the material allows heat to move through it efficiently, which is vital for certain applications.
In cooking utensils, high conductivity allows for even heating across the surface, preventing hot spots and ensuring that food cooks uniformly. High conductivity materials, such as metals, are common in kitchenware because they help achieve consistent cooking results.
When selecting a cooking utensil, consider the following:
  • High Conductivity: Quick and even heat dispersion
  • Low Conductivity: Slower heat transfer, potential for uneven cooking
Thus, cooking utensils benefit greatly from materials with high thermal conductivity.
Choosing the Right Cooking Utensils
For effective cooking, selecting the right materials for your utensils is essential Cooking utensils should ideally have both low specific heat and high thermal conductivity This combination ensures that the utensil heats up quickly and delivers heat efficiently to the food.
  • Low Specific Heat: Allows the utensil to heat up swiftly.
  • High Thermal Conductivity: Ensures even heat distribution.
These properties enable efficient energy use and enhance cooking performance, which makes them favored features in pans, pots, and other kitchen tools.

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Most popular questions from this chapter

The specific heat of substance varies with temperature according to cquation \(c=\left(2 t^{2}+t\right) \times 10^{-3}\) cal/g \({ }^{\circ} \mathrm{C}\). Caleulate the amount of heal required to raise the temperatuc of \(100 \mathrm{~g}\) of substance from \(20^{\circ} \mathrm{C}\) to \(40^{\circ} \mathrm{C}\)

A wall has two layers \(A\) and \(B\), each made of diffeent materials, The thickness of both the layers is the same. The thermal conductivity of \(A, K_{A}=3 K_{B^{*}}\) The temperature across the wall is \(20^{\circ} \mathrm{C}\). In thermal equilibrium (a) the temperature difference across \(A=150^{\circ} \mathrm{C}\) (b) rate of heat transfer across \(A\) is more than across \(B\) (c) rate of heat transfer across both is same (d) temperature difference across \(A\) is \(5^{\circ} \mathrm{C}\) :

Temperature at which person can feel metal rod and wooden block to be equally hot is (a) his body temperature (b) twice has body temperature (c) four times equal to body temperature (d) temperature cqual to their ratio of specific heat capacities

For an enclosure maintained at \(2000 \mathrm{~K}\), the maximum radiation occurs at wavelength \(\lambda_{\mathrm{m}^{\prime}}\). If the temperature is raised to \(3000 \mathrm{~K}\), the peak will shift to (a) \(0.5 \lambda_{\mathrm{m}}\) (b) \(\lambda_{m}\) (c) \(\frac{2}{3} \lambda_{m}\) (d) \(\frac{3}{2} \lambda_{m}\)

\(\Lambda\) sphcrical shell of radius \(R\) is filled with water. Temperature of atmosphere is \((-\theta){ }^{\circ} \mathrm{C}\), where \(\theta\) is a positive constant. The shell is exposed to atmosphere and all water comes down to \(0^{\circ} \mathrm{C}\) and then it starls freczing from ouler surface towards the centre of the shell. Assuming shell to be highly conducting, calculate time for whole mass of water at \(0^{\circ} \mathrm{C}\) to freczo. Thermal conductivily of ice is \(K\) and latent heal of fusion is \(L\). Density of water is \(p\). Neglecl expansion during fusion.
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