Active learning ideas
Understanding heat transfer is the 'science' in Food Science. This topic covers conduction, convection, and radiation, explaining how energy moves from a heat source to our food. Whether it is the direct contact of a wok on a flame or the circulating air in an oven, these principles dictate how food cooks and tastes. For Secondary 2 students, this connects physics concepts to the practical reality of the kitchen.
Activity 01
Students place ice cubes on different surfaces (metal, plastic, wood) to observe conduction speeds. They record data and relate these findings to why we use specific materials for pots and handles.
How does heat travel through different cooking mediums?
Activity 02
In an open space, students act as water molecules in a pot. They demonstrate convection by moving 'up' when heated and 'down' as they cool, helping them visualize how heat circulates in boiling water.
What is the difference between conduction and convection?
Activity 03
Students compare how a potato cooks in a microwave (radiation) versus an oven (convection/radiation). They discuss the differences in texture and speed with a partner before sharing with the class.
How does radiation cook our food in a microwave oven?
A few notes on teaching this unit
Watch Out for These Misconceptions
Heat and temperature are the same thing.
Students often use these terms interchangeably. Through hands-on experiments, they can see that heat is the energy being transferred, while temperature is the measurement of that energy.
Microwaves cook food from the 'inside out'.
This is a common myth. Peer explanation of how radiation excites water molecules near the surface, which then conduct heat inward, helps correct this misunderstanding.
Methods used in this brief
Methods of Cooking and Nutritional Changes
Compare various cooking methods such as boiling, steaming, baking, and frying, and evaluate their impact on nutrient retention.
8 methodologies
Functional Properties of Food
Discover the scientific principles behind food reactions, such as gelatinisation, coagulation, and caramelisation. Observe how ingredients change physically and chemically when heated.
8 methodologies