Question

Why should we read the thermometer by keeping​ the level of mercury along the line of sight?​

• A. To avoid fall of mercury level back to bulb rapidly​
• B. To avoid reading wrong value ​
• C. To avoid any damage to the eyes​
• D. To avoid any leakage of mercury from the thermometer​

Answer 1

The correct option is B To avoid reading wrong value ​

To avoid reading the wrong value, it is always advised to record thermometer measurements along the line of sight or eye level.

When someone does not read the thermometer by keeping the level of mercury along the line of sight, there is a high possibility of them observing a wrong value, i.e. the value can be smaller or larger than the original value.

To avoid this error, it is always advised to record thermometer measurements while keeping the mercury level aligned with the eye level.