Page 135 - text book form physics kssm 2020

Chapter 4
Heat
Experiment 4.1

Aim: To determine the specifi c heat capacity of water
Apparatus: Power supply, immersion heater, beaker, stopwatch, thermometer, retort stand
and electronic balance
Materials: Water and tissue paper

Procedure:
1. Wrap a beaker with tissue paper.
2. Place the beaker on top of an electronic balance and reset the reading of the balance
to zero.
3. Fill the beaker with water until it is three-quarter full.
4. Record the reading of the mass of the water, m shown on the electronic balance.
5. Set up the apparatus as shown in Figure 4.10.

SMART
SMART INFO
Figure 4.10
Immersion heater converts
6. Record the initial temperature of the water, θ . electrical energy to heat energy.
1
7. Switch on the immersion heater and start the stopwatch The heat energy supplied by the
at the same time. immersion heater is
8. Observe the change in the thermometer reading. Q = Pt, where
9. After fi ve minutes, switch off the immersion heater. P = power of heater and
Record the highest thermometer reading as the fi nal t = period of time heater
water temperature, θ . is switched on
2
Change in water temperature,
Δθ = θ – θ . 1
2
For this experiment, the equation
Q = mcΔθ is expressed as
Pt = mc (θ – θ ).
2 1
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4.2.3 129
4.2.3