Question

as a student is heating up a flask of water on a hot plate, their teacher tells them that they can observe all three types of heat transfer.
conduction can be seen as the hot water warms and rises and cools.
convection is flask, and can be seen by holding a hand over the hot plate and feeling warmth without touching it.
radiation

Explanation:

• Conduction: It is the transfer of heat through direct contact. Here, heat moves from the hot plate (source of heat) to the flask (solid object in direct contact with the hot plate).
• Convection: It is the transfer of heat through the movement of fluids (liquids or gases). In the flask, as the water is heated, the hot water (less dense) rises and the cooler water (more dense) sinks, creating a cycle of fluid movement which is convection.
• Radiation: It is the transfer of heat in the form of electromagnetic waves. When a hand is held over the hot plate and feels warmth without touching it, the heat is reaching the hand through radiation (as there is no direct contact - no conduction and no significant fluid movement in the air in that context for it to be convection in this particular sense of feeling warmth from a distance).

Answer:

First blank: Conduction; Second blank: Convection; Third blank: Radiation.