Which is the best method to teach the concept of ‘Insolation’?

Concept: Choosing a teaching method means matching the technique to the nature of what is being taught. Methods that let learners directly observe or measure a physical or natural process are best conveyed through demonstration; methods built around ethical or social dilemmas use case studies; open-ended idea generation uses brain-storming; and opinion or practice data is gathered through surveys.

Application: Insolation is the incoming solar radiation that reaches the Earth's surface — a physical, measurable phenomenon. A demonstration (for example, placing thermometers in sunlight versus shade, or using a torch and a globe to show how radiation intensity changes with the angle of incidence) lets learners directly see and measure the effect, turning an abstract idea into a concrete, observable process.

Cross-check: comparing insolation against the purpose each method actually serves confirms the fit:

• Case study — suits analysing a specific real-world scenario involving judgement or ethics, not showing a physical radiation process.

• Brain-storming — suits generating a range of ideas on an open-ended question, not conveying a fixed scientific concept.

• Survey — suits collecting data or opinions from a group, not demonstrating a natural phenomenon.

Because insolation is best learned by observing the physical effect of solar radiation, demonstration is the most effective of the four listed methods for teaching it.