Advertisements
Advertisements
प्रश्न
Explain the following
A hollow glass sphere which floats with its entire volume submerged in water at 4°C, sinks when water is heated above 4°C.
Advertisements
उत्तर
On heating water above 4°C, the density of water decreases. As a result, the upthrust acting due to water on hollow glass sphere also decreases, which causes it to sink.
APPEARS IN
संबंधित प्रश्न
How does the anomalous expansion of water help aquatic organisms in cold climates?
Observe the following graph. Considering the change in volume of water as its temperature is raised from 0°C, discuss the difference in the behaviour of water and other substances. What is this behaviour of water called?
What is the role of the anomalous behaviour of water in preserving aquatic life in regions of cold climate?
1 kg of ice at 0°C is mixed with 1 kg of steam at 100°C. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = 3.36 × 103 J kg−1 and latent heat of vaporization of water = 2.26 × 106 J kg−1.
Calculate the time required to heat 20 kg of water from 10°C to 35°C using an immersion heater rated 1000 W. Assume that 80% of the power input is used to heat the water. Specific heat capacity of water = 42000 J kg−1 K−1.
Describe an experiment to show that water has maximum density at 4°C. What important consequences follow this peculiar property of water? Discuss the importance of this phenomenon in nature.
Water is cooled from 4 °C to 0 °C. It will :
Observe the given graph and answer the following questions:
- Name the process represented in the figure.
- At what temperature does this process take place?
In a region with a cold climate the aquatic animals can survive at 4 °C, because _______.
