📚 Heat Transfers Circus Mark Scheme | 热传递实验巡回站评分方案
In a KS3 science classroom, a heat transfers circus lets you move around different experiment stations to observe conduction, convection and radiation. This mark scheme explains exactly what examiners look for when they award marks to your observations, tables, graphs and conclusions.
在 KS3 科学课堂上，热传递巡回站让你在不同实验台之间轮转，观察传导、对流和辐射。这份评分方案准确说明考官在给你的观察、表格、图表和结论打分时关注什么。
1. Overview of the Heat Transfers Circus | 热传递巡回站概览
A circus is a set of short practical stations. You may spend about 10 minutes at each one. The heat transfers circus usually has at least three stations: conduction, convection and radiation.
巡回站是一组短小的实验台。你可能在每个实验台停留约 10 分钟。热传递巡回站通常至少有三个实验台：传导、对流和辐射。
For each station you need to identify the variable being changed, the variable being measured and the controls. You also need to record data and then use the pattern to write a conclusion.
在每个实验台，你需要识别改变的变量、测量的变量以及控制变量。你还需要记录数据，然后利用规律写出结论。
2. Station 1: Conduction Through Metal Rods | 实验一：金属棒传导
In this station, drawing pins are often stuck to a metal rod using small equal blobs of petroleum jelly. The rod is heated at one end, and the pins drop off one by one as heat travels along the rod.
在这个实验中，通常用等量凡士林把图钉粘在金属棒上。加热金属棒一端，随着热量沿棒传递，图钉会逐个掉落。
The mark scheme looks for the idea that conduction happens mainly in solids because vibrating particles pass energy to their neighbours without the material moving as a whole.
评分方案关注的是：传导主要发生在固体中，因为振动的粒子将能量传递给相邻粒子，而材料整体并不移动。
- Independent variable: distance of the pin from the heat source.
- Dependent variable: time taken for the pin to drop.
- Control variables: length and type of rod, amount of petroleum jelly, shape of pin.
中文要点配对：
- 独立变量：图钉离热源的距离。
- 因变量：图钉掉落所需时间。
- 控制变量：金属棒的长度与种类、凡士林用量、图钉形状。
3. Station 2: Convection in a Liquid | 实验二：液体中的对流
Convection is usually shown by gently heating a beaker of water with a small crystal of potassium permanganate at the bottom. The purple colour rises, spreads across the top, then sinks at the cooler side, forming a circulation loop.
对流实验通常是在烧杯底部放一小粒高锰酸钾晶体，然后温和加热。紫色会上升，沿顶部扩散，然后在较冷的一侧下沉，形成循环。
The mark scheme requires you to state that convection occurs in liquids and gases. Particles gain energy, move faster and spread out, making the heated fluid less dense, so it rises. Cooler fluid is denser and sinks.
评分方案要求你说明对流发生在液体和气体中。粒子获得能量、运动加快、间距变大，使受热流体密度变小，所以上升。较冷流体密度较大，因此下沉。
A common one-mark explanation is: 'Heated water expands, becomes less dense and rises. Cold water moves in to replace it and is then heated.'
常见的 1 分解释是：“受热的水膨胀、密度变小而上升。冷水流过来补充，然后被加热。”
4. Station 3: Radiation from Black and Silver Surfaces | 实验三：黑色与银色表面的辐射
In the radiation station, two metal cans or Leslie cubes are used. One side is matt black and the other is shiny silver. A heater or a lamp shines equally on both surfaces, and temperature sensors record the rise in temperature.
在辐射实验中，使用两个金属罐或 Leslie 立方体。一面是哑光黑色，另一面是光亮银色。加热器或灯均匀照射两个表面，温度传感器记录温度上升。
The mark scheme expects you to know that radiation is the transfer of thermal energy by infrared electromagnetic waves. It does not need particles, so it can travel through a vacuum.
评分方案希望你知道辐射是通过红外电磁波传递热能。它不需要粒子，因此可以在真空中传播。
- Matt black surfaces are good absorbers and good emitters of infrared radiation.
- Shiny silver surfaces are poor absorbers and poor emitters, but good reflectors.
中文：
- 哑光黑色表面是良好的红外辐射吸收体和发射体。
- 光亮银色表面是不良吸收体和不良发射体，但反射性好。
5. Marking Variables and Fair Testing | 变量与公平测试评分
For every station, examiners often award separate marks for writing the independent variable, the dependent variable and at least two control variables. You must use the words 'same' or 'constant' for controls.
在每个实验台，考官通常会分别给独立变量、因变量和至少两个控制变量打分。你必须使用“相同”或“恒定”等词来描述控制变量。
Example: 'Use the same metal rod, the same amount of petroleum jelly and the same size pin so the test is fair.' This clearly identifies controls and justifies them.
例如：“使用相同的金属棒、相同量的凡士林和相同尺寸的图钉，使测试公平。”这清楚地指出了控制变量并说明理由。
If you write 'to make it a fair test' without listing controls, you may only get partial credit.
如果你只写“为了公平测试”而没有列出控制变量，可能只能得到部分分数。
6. Marking Data Collection and Tables | 数据记录与表格评分
Marks for tables usually require a ruled table with columns for the independent variable and dependent variable, with clear headings and units. For example: Distance from heat source (cm) and Time to drop (s).
表格的分数通常要求画出带边框的表格，列包含独立变量和因变量，标题清晰并带单位。例如：离热源距离（cm）和掉落时间（s）。
You should record repeated readings where possible, then calculate a mean. Repeat readings improve reliability by reducing the effect of random errors.
在可能的情况下，你应记录重复读数，然后计算平均值。重复读数通过减小随机误差的影响来提高可靠性。
In the mark scheme, there may be a mark for using the correct unit. Always write the unit in the header, not next to every value.
在评分方案中，可能有一分是正确使用单位。始终在表头写单位，而不是在每个数值旁写单位。
7. Marking Graphs and Trends | 图表与趋势评分
When you plot a graph, the mark scheme rewards: labelled axes with units, a sensible linear scale, points plotted accurately, and a line of best fit if appropriate.
当你绘制图表时，评分方案奖励：带单位的坐标轴标签、合理的线性刻度、准确描点，以及适当时绘制最佳拟合线。
For conduction, the graph of distance from hot end against time to drop would usually show a positive correlation: pins farther from the heat source take longer to fall.
对于传导实验，距离热源的距离与掉落时间的图通常呈现正相关：离热源越远的图钉掉落时间越长。
You should describe the trend using 'as ... increases, ... increases' rather than just saying 'the line goes up'.
你应该用“随着……增加，……增加”来描述趋势，而不是只说“线上升”。
8. Marking Conclusions | 结论评分
A full-mark conclusion links the data to a scientific explanation. For conduction: 'The pin nearest the flame dropped first because heat energy is conducted along the metal from hot to cold by particle vibrations.'
满分的结论会将数据与科学解释联系起来。对于传导：“离火焰最近的图钉最先掉落，因为热能以粒子振动方式沿金属从热端传到冷端。”
For convection: 'The purple colour moved in a loop because warm water rose, replaced by cold water sinking, showing a convection current.'
对于对流：“紫色以环状移动，因为温水上升，冷水下沉补充，显示了对流循环。”
For radiation: 'The black surface heated faster than the shiny one, so matt black is a better absorber of infrared radiation.'
对于辐射：“黑色表面比光亮表面升温更快，因此哑光黑色是更好的红外辐射吸收体。”
9. Common Misconceptions and Mark Penalties | 常见误区与扣分点
One common error is saying 'heat rises'. Heat is energy, not a substance. In convection, it is the hot fluid that rises because it is less dense.
一个常见错误是说“热量上升”。热是能量，不是物质。对流中是受热流体因为密度较小而上升。
Another misconception is that conduction requires particles to move from the hot end to the cold end. In fact, particles only vibrate and pass energy; they do not travel along the rod.
另一个误区是认为传导需要粒子从热端移动到冷端。实际上，粒子只是振动并传递能量，并不沿金属棒移动。
Writing 'radiation needs air to travel' loses a mark because infrared radiation can travel through a vacuum.
写“辐射需要空气才能传播”会扣分，因为红外辐射可以在真空中传播。
10. Model Answers for Key Questions | 关键问题模型答案
Question: 'Describe how energy is transferred through a metal rod.' Model answer: 'Energy is transferred by conduction. Particles near the heat source vibrate more and bump into neighbouring particles, passing the energy along the rod.'
问题：“描述能量如何通过金属棒传递。”模型答案：“能量通过传导传递。靠近热源的粒子振动更剧烈，并碰撞相邻粒子，将能量沿金属棒传递。”
Question: 'Explain why a shiny silver blanket keeps a runner warm.' Model answer: 'The shiny surface is a poor emitter of infrared radiation, so less heat is lost from the runner's body. It also reflects heat back.'
问题：“解释为什么光亮银色毯子能让跑步者保暖。”模型答案：“光亮表面是红外辐射的不良发射体，因此跑步者身体散失的热量较少。它还能将热量反射回去。”
| Key term 关键术语 |
Meaning 含义 |
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