why fishes can breathe when upper layer is freeze,although oxygen cannnot pass through solid?
Asked by nisha_vini29 | 10th May, 2015, 08:50: PM
Water boils at 100 degree Celsius (100 °C) and freezes at 0 °C. When the outside temperature falls below the freezing point of water, lakes and rivers get frozen. However, only the top layer of the lake or river freezes. Underneath the frozen upper layer, the water remains in its liquid form and does not freeze. Also, oxygen is trapped beneath the layer of ice. As a result, fish and other aquatic animals find it possible to live comfortably in the frozen lakes and ponds. Generally, all liquids expand on heating, but water is an exception to this rule. This irregular expansion of water is called anomalous expansion. This anomalous expansion plays an important role by only freezing the upper layer in lakes and rivers.
Answered by Arvind Diwale | 11th May, 2015, 10:49: AM
- How does evapration cause cooling. Explain with an example
- Why does our palm feel cold when we put some perfume on it
- what is evapouration?
- Answer the following: (a) Temperature remains constant until the whole solid changes to liquid although heat energy is constantly supplied. Why? (b) Temperature remains constant during boiling although heat is constantly supplied. Why? (c) Ice has lower density than water. Why?
- difference between boiling and evaporation
- Is alchohol volatile? Give rason
- i want 60 questions/answers in chapter Matter In Our Surrounding
- why an iron almirah is a solid at room temperature? State the characteristics of matter demonstrated by: a)Diffusion b)Brownian motion Explain how the smell of food being cooked in kitchen reaches us even from considerable distance? Explain why diffusion occurs more quickly in gas than in liquids?
- Which statement regarding the effect of humidity on evaporation is correct? Humidity has no effect on evaporation. With the increase in humidity, rate of evaporation decreases. With the decrease in humidity, rate of evaporation decreases. Humidity sometimes increases and sometimes decreases the rate of evaporation. pls explain.
- Why 0°C can be solid as well as liquid ?
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Verify mobile number
Enter the OTP sent to your number