Advertisements
Advertisements
प्रश्न
Describe an experiment to demonstrate that water absorbs heat during boiling at a constant temperature.
Advertisements
उत्तर
BOILING POINT OF WATER AT CONSTANT TEMPERATURE:
Take some water in a beaker. Suspend and clamp a thermometer in a beaker in water so that the bulb of thermometer remains in water without touching bottom and sides of the beaker. Supply heat by the burner and note the temperature at room temperature (20°C nearly)
Record the temperature after every minute. The temperature rises and as it reaches 100°C water starts boiling. Though heat is being supplied temperature does not rise i.e. it remains constant at 100°C and bubbles formed are seen. Thus, the boiling point of water is 100°C and at boiling point heat supplied is absorbed by water at a constant temperature. Because this heat is being used to change every molecule of water into vapours.
APPEARS IN
संबंधित प्रश्न
Differentiate between melting point and boiling point, giving atleast one example of each.
Explain the term vaporization.
How is the boiling point of water affected when some salt is added to it?
It is difficult to cook vegetables on hills and mountains. Explain the reason.
A pressure cooker is based on the principle that boiling point of water increases with the ______.
Choose the correct statement of the following
The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in kelvin scale?
A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.
____________ is the change of solid state directly to vapour state without going through the ____________ state.
Conversion of solid to vapour is called sublimation. Name the term used to denote the conversion of vapour to solid.
