The thermal behaviour of a material is characterised by the value of its

Question

BlackTom AI · Accepted Answer

Specific heat (specific heat capacity) is the property that characterises how a material’s temperature changes when it absorbs or releases heat.

1) Relevant knowledge points and concepts
- Specific heat c is defined as the amount of heat Q required to raise the temperature of unit mass m of a substance by one degree: c = Q / (m ΔT). Units: J·kg−1·K−1.
- Thermal conductivity (different concept) describes how fast heat flows through a material, not how much temperature rises for a given energy input.
- Volumetric heat capacity (ρc) is heat capacity per unit volume (J·m−3·K−1), sometimes confused with “heat density,” but the standard term for the material’s thermal storage per unit mass is specific heat.

2) Step-by-step reasoning
- The phrase “thermal behaviour” in the sense of how a material’s temperature responds when heat is added refers to its capacity to store heat per unit mass → that is specific heat.
- Use the heat equation Q = m c ΔT to connect heat added to temperature change; rearranged ΔT = Q / (m c). A larger c means a smaller temperature rise for the same added heat, demonstrating the material’s thermal response.

3) Example calculation (intermediate steps shown)
- Suppose m = 0.5 kg of a material with c = 4186 J·kg−1·K−1 (water) and Q = 5000 J added:
  ΔT = Q / (m c) = 5000 J / (0.5 kg × 4186 J·kg−1·K−1)
  = 5000 / (2093) ≈ 2.39 K.
- This calculation explicitly shows how c determines the temperature change.

4) Why the correct answer is correct
- Specific heat directly quantifies how much the temperature of a given mass will change when heat is supplied, so it characterises thermal behaviour in the sense intended.

5) Why the other options are incorrect
- a. thermal index: not a standard physical property for quantifying temperature response.
- b. heat constant: not a standard term; ambiguous (may be confused with heat capacity, but “constant” is not used).
- d. heat density: ambiguous; could suggest energy per unit volume or volumetric heat capacity, but the conventional, precise descriptor for thermal response per unit mass is specific heat.

Conclusion: The correct choice is c. specific heat, which matches the provided answer.

The thermal behaviour of a material is characterised by the value of its单项选择题

类似问题

Water has a high specific heat capacity; it takes a lot of energy--either gained or lost--to change its temperature. In the physical world, what does this mean?

The thermal behaviour of a material is characterised by the value of its

____________ is the amount of heat required to raise the temperature of 1 gram of a substance 1 degree Celsius.

What is the formula of the energy required to change the temperature?

It is a well-known fact that water has a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat flow, 300 J, is added to each. Which statement is true?

Temperature of land rises more quickly than that of sea because

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单