it has low vapour pressure
it is clearly visible
it has low surface tension
it can provide longer column due to low density
Answer is Right!
Answer is Wrong!
The correct answer is: A. it has low vapour pressure.
Alcohol is used in manometers because it has low vapour pressure. This means that it will not evaporate easily, which is important for a manometer because it needs to be able to accurately measure pressure. If the alcohol evaporated too easily, it would cause the pressure reading to be inaccurate.
The other options are not correct because:
- B. it is clearly visible is not a necessary property for a manometer. Manometers can be made of other materials that are not as visible, but are still accurate.
- C. it has low surface tension is not a necessary property for a manometer. Manometers can be made of other materials that have higher surface tension, but are still accurate.
- D. it can provide longer column due to low density is not a necessary property for a manometer. Manometers can be made of other materials that have higher density, but are still accurate.
In conclusion, alcohol is used in manometers because it has low vapour pressure. This means that it will not evaporate easily, which is important for a manometer because it needs to be able to accurately measure pressure.