Prelab Brief
To study the three modes of heat transfer (conduction, convection, radiation) and demonstrate thermal expansion of solids using the ball-and-ring experiment.
📘
Theory
Explore conduction, convection, radiation, and the ball-and-ring thermal expansion experiment. To study the three modes of heat transfer (conduction, convection, radiation) and demonstrate thermal expansion of solids using the ball-and-ring experiment.
∑
Formula
Principle: To study the three modes of heat transfer (conduction, convection, radiation) and demonstrate thermal expansion of solids using the ball-and-ring experiment.
🎯
Aim
To study the three modes of heat transfer (conduction, convection, radiation) and demonstrate thermal expansion of solids using the ball-and-ring experiment.
🧰
Apparatus
- Metal ball and ring apparatus
- Spirit lamp / Bunsen burner
- Metal rod with wax dots
- Beaker with water and potassium permanganate
- Thermometer
- Tongs
🧪
Procedure
- Heat the metal ball and try passing it through the ring — observe thermal expansion.
- Cool the ball and try again — observe contraction.
- Fix wax dots on a metal rod and heat one end — observe conduction as dots melt sequentially.
- Heat water with KMnO₄ crystals at the bottom — observe convection currents.
- Place your hand near (not touching) a hot object — feel radiation.
Pre-Lab Questions
What is the main aim of the Heat Transfer & Thermal Expansion Experiment?
Which principle is demonstrated in the Heat Transfer & Thermal Expansion Experiment?
What apparatus is required for this experiment?
Why is Metal ball and ring apparatus used in this experiment?
What formula or relationship is verified in this experiment?
What precaution should be followed while performing this experiment?
What conclusion can be drawn from the Heat Transfer & Thermal Expansion Experiment?