When we determine the boiling point of liquid the thermometera)Should...
While measuring temperature, the laboratory thermometer should be held vertically. It should be surrounded from all sides by the substance(water in this case) whose temperature is to be measured and hence, it should not touch the sides or the bottom of the beaker.
When we determine the boiling point of liquid the thermometera)Should...
Answer:
Introduction:
When determining the boiling point of a liquid using a thermometer, it is important to follow certain guidelines to ensure accurate measurements. The correct option in this case is option 'B', which states that the thermometer should be above the liquid and remain vertical. Let's explore why this is the correct choice.
Explanation:
To measure the boiling point of a liquid, the thermometer should be positioned in a way that allows it to accurately measure the temperature of the vapor being produced. Placing the thermometer in different positions can lead to inaccurate readings. Here's why option 'B' is the correct choice:
Above the liquid:
Placing the thermometer above the liquid ensures that it measures the temperature of the vapor rather than being influenced by the temperature of the liquid itself. The boiling point of a liquid is the temperature at which its vapor pressure equals the atmospheric pressure. By positioning the thermometer above the liquid, it can accurately measure the temperature of the vapor as it escapes from the liquid.
Remain vertical:
Keeping the thermometer vertical ensures that it is immersed in the rising vapor and not tilted towards any particular direction. This helps in obtaining a more precise reading as the thermometer is evenly exposed to the vapor and can measure its temperature uniformly. Tilting the thermometer could lead to uneven temperature measurements, affecting the accuracy of the boiling point determination.
Other options:
- Option 'A': Dipping the thermometer into the liquid would measure the temperature of the liquid itself, not the boiling point. This would not provide accurate results.
- Option 'C': Touching the bottom of the container could lead to the thermometer measuring the temperature of the container rather than the vapor. This would result in inaccurate readings.
- Option 'D': Placing the thermometer slanting in the liquid would likely lead to inaccurate measurements as the thermometer would not be fully immersed in the rising vapor.
Conclusion:
To determine the boiling point of a liquid accurately, it is important to position the thermometer above the liquid and keep it vertical. This ensures that the thermometer measures the temperature of the vapor being produced, leading to more precise and reliable results.