Page 149 - Physics - XI

Table to study the eff ect of material of container on rate of cooling of a liquid

Metallic tumbler (A) Plastic tumbler (B)
S. No.
Time (min) Temperature, T (°C) Time (min) Temperature, T (°C)
A B
1.
2.

3.

4.

5.

Y

Temperature (°C) Calorimeter B Scale used on:
Calorimeter A
X-axis, 1 cm = ... min
(Big one)
Y-axis, 1 cm = ... °C

(Small one)

X
Time (min)

Fig. 5.2: Graph showing the eff ect of area of surface on rate of cooling

Result

1. The rate of cooling in the larger calorimeter as compared to the smaller calorimeter is _______ °C/min.

2. Least rate of cooling observed in calorimeter _________ is _________ °C/min.
3. Black surface radiate _________ heat as compared to white or polished surface in the same time when

heated to the same temperature.
4. The rate of cooling of a liquid in the plastic mug is _________ °C/min.

Precautions

1. Same volume of same liquid should be taken in all the cases.

2. Graph of one case should be plotted on the same graph paper on the same scale.

Sources of Error

Surroundings temperature may change.

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