Advertisements
Advertisements
Question
Explain the following
In winter, water tanks (or ocean) start freezing from the surface and not from the bottom.
Solution
In winters, when temperature falls, the surface of water in the tank contracts, becomes denser and sinks to the bottom. A circulation is thus set up until the entire water in the tank reaches its maximum density at 4°C. If the temperature falls further, then the top layer expands and remains on the top till it freezes. Thus, water in a tank starts freezing from the top and not from the bottom.
APPEARS IN
RELATED QUESTIONS
What is the Kelvin scale of temperature?
Who am I?
I’m found in a thermometer, I measure your temperature.
What is the unit of coefficient of linear expansion?
One liter of mercury at 100C is heated to 300C. Find the increase in the volume of mercury. The coefficient of cubical expansion of mercury is 1.8 X 10-4 0C-1.
Is it possible to heat a liquid or gas from above? Explain your answer.
Where am I?
The mean annual temperature around me is 10°C.
Match the following:
| Column-I | Column-II | |
| 1. | Temperature | Beam balance |
| 2. | Mass | Ruler |
| 3. | Length | Digital clock |
| 4. | Time | Thermometer |
