热能公式
热能是系统内存在的能量。它负责维持系统的温度。热量是热能的传递。热力学是一门研究不同类型系统之间热传递的物理学学科。它还涉及在整个过程中完成任务的方式。
热能
The energy obtained from heat is referred to as thermal energy. The movement of small particles within the system usually causes the heat produced by thermal energy. It’s the energy that allows heat to circulate within a system. In most cases, heat is generated as particles move around within an object.
热能对系统的温度负责,是系统总能量的一个组成部分,由势能和动能组成。 Q 是表示热能的常用方式。它的质量、温差和比热都是成正比的。
热能以焦耳为单位,这是一种 SI 测量单位 (J)。
热能公式
热能公式如下:
Q = mcΔT
Where,
- Q = Thermal Energy
- m = Give substance Mass
- c = Specific heat
- ΔT = Difference in Temperature
公式的推导
We have,
Specific heat capacity = (Thermal energy input) / ((mass) × (Temperature change))
However, because the formula requires special symbols, we can say that C stands for specific heat capacity, T stands for temperature, and Et stands for thermal energy. It’s vital to realize, however, that T isn’t used as a stand-alone phrase; rather, it represents the change in T through time. ΔT is the most common symbol for change is Δ. Meanwhile, we can suppose that the input is the amount that determines the change in thermal energy, which is denoted by ΔEt.
Thus, c = (ΔEt)/(m × ΔT)
∴ ΔEt = mcΔT
示例问题
问题 1. 物质的质量规定为 16 kg,其比热为 0.068 J/kg °C。温差表示为 23°C。根据数据确定物质的热能。
回答:
Given: m = 16 kg, c = 0.068 J/kg °C, ΔT = 23°C.
Since,
Q = mcΔT
∴ Q = 16 × 0.068 × 23
∴ Q = 25.02 Joules
问题 2. 假设 12 kg 的物质温度变化 55 摄氏度,比热为 0.04 J/kg °C。使用给定的信息确定化合物的热能。
回答:
Given: m = 12 kg, c = 0.04 J/kg °C, ΔT = 55°C.
Since,
Q = mcΔT
∴ Q = 12 × 0.04 × 55
∴ Q = 26.4 Joules
问题 3. 当你交流 1800 焦耳的能量时,263 克水的温度升高了多少?水的比热为 3482 J/kg°C。
回答:
Given: m = 263 g = 0.263 kg, c = 3482 J/kg °C, Q = 1800 Joules
Since,
Q = mcΔT
∴ ΔT = Q/mc
∴ ΔT = (1800) / (0.263 × 3482)
∴ ΔT = 1800 / 915.8
∴ ΔT = 1.965 °C.
问题4.如果铜的比热为453 J/kg°C,将0.36 kg铜的温度升高23°C需要多少能量?
回答:
Given: m = 0.36 kg, c = 453 J/kg °C, ΔT = 23°C.
Since,
Q = mcΔT
∴ Q = 0.36 × 453 × 23
∴ Q = 3750.8 Joules
问题 5. 一种物质的质量为 20 kg,其热能为 686 J。温差为 23°C。根据事实,确定比热。
回答:
Given: m = 20 kg, Q = 686 J, ΔT = 23°C
Since,
Q = mcΔT
∴ c = Q/mΔT
∴ c = (686) / (20 × 23)
∴ c = 686 / 460
∴ c = 1.491 J/kg °C
问题 6. 使用 3820 J/kg °C 的水的比热,确定 23 kg 水在传输约 1900 焦耳的能量后温度将升高的量。
回答:
Given : m = 23 kg, c = 3820 J/kg °C, Q = 1900 Joules
Since,
Q = mcΔT
∴ ΔT = Q/mc
∴ ΔT = (1900) / (23 × 3820)
∴ ΔT = 1900 / 8786
∴ ΔT = 0.2162 °C.
问题 7. 什么是热能的 SI 单位?
回答:
SI unit of Thermal Energy is Joules.
问题 8. 解释热能公式。
回答:
The formula for thermal energy is as follows :
Q = mcΔT
Where,
- Q = Thermal Energy
- m = Give substance Mass
- c = Specific heat
- ΔT = Difference in Temperature