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प्रश्न
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उत्तर
Take a round bottom flask which is filled with air and closed with a one holed rubber cork. A narrow capillary tube is passed through the cork and the flask is supported on a tripod in an inverted position as shown in the figure, so that the end of the capillary tube is underwater. Now, heat the flask gently with a spirit lamp. You will observe bubbles coming out from the capillary tube. This shows that gases expand on heating.
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संबंधित प्रश्न
Consider the situation of the previous problem. Assume that the temperature of the water at the bottom of the lake remains constant at 4°C as the ice forms on the surface (the heat required to maintain the temperature of the bottom layer may come from the bed of the lake). The depth of the lake is 1.0 m. Show that the thickness of the ice formed attains a steady state maximum value. Find this value. The thermal conductivity of water = 0.50 W m−1°C−1. Take other relevant data from the previous problem.
What do you mean by the anomalous expansion of water?
Explain the following
Fishes survive in ponds even when the atmospheric temperature is well below 0°C.
Draw a graph between volume and temperature, when 5 cm3 of ice at -10°C is heated to form water at +10°C.
Explain, why does a glass bottle completely filled with water and tightly capped burst when placed in a freezer?
What are hot spots? How can you extract energy from a hot spot, if it does not come in contact with underground water?
Study the following diagrams and write down your observations.
Give reasons for the following:
Even when the water in the lakes is frozen, fish can survive.
In a region with a cold climate the aquatic animals can survive at 4 °C, because _______.
