Physics 2016 JAMB Past Questions - Question 33: Mercury is suitable as a barometric fluid because it

Correct Answer

B

Explanation

has several properties that make it ideal for use in barometers. Firstly, mercury is a dense liquid, which means it can accurately measure small changes in atmospheric pressure. This is important for accurate barometric readings.

Secondly, mercury has a low vapor pressure, which means it doesn't easily evaporate at normal temperatures. This ensures that the mercury remains in its liquid state within the barometer, providing consistent and reliable measurements over time.

Additionally, mercury has a wide temperature range in which it remains in its liquid state, from -38.83°C to 356.73°C (-37.89°F to 674.14°F). This makes it suitable for use in various environments and climates.

Furthermore, mercury is relatively inert and doesn't react with most materials, which minimizes the risk of corrosion or contamination within the barometer.

However, it's important to note that mercury is a toxic substance and poses health and environmental risks. Due to these concerns, the use of mercury in barometers has been phased out in many applications, and alternative fluids, such as silicones or oils, are often used instead.