# What will be the atmospheric pressure if the height of mercury is 76cm?

Table of Contents

## What will be the atmospheric pressure if the height of mercury is 76cm?

A column height of 76 cm of mercury is 760 mm Hg which is defined as 1 atm when the temperature is 0°C. The SI unit for pressure is the Pascal (Pa). Not the atm. 1.01 ^5 Pa = 1 atm.

**Why is the height of mercury column nearly 76 cm in the tube?**

Air pressure is the weight of air in the atmosphere above the reservoir (bowl of mercury). So, the level of mercury continues to changes until the weight of mercury in the glass tube is exactly equal to weight of the air above the reservoir, which is 76 cm.

**How does the pressure at the bottom of the 76 cm column of mercury in a barometer compared to the pressure due to the weight of the atmosphere?**

They are approximately equal. How does the pressure at the bottom of a 76-cm column of mercury in a barometer compare with the air pressure at the bottom of the atmosphere? The pressures are equal. Mercury is 13.6 times denser than water.

### What happens to the height of the mercury in the tube if the atmospheric pressure increases?

There is a direct relation between the air pressure and height of mercury column. If atmospheric pressure increases, the height of mercury column will also increase.

**How do you find the height of mercury with pressure?**

Show the calculation supporting the claim that atmospheric pressure near sea level corresponds to the pressure exerted by a column of mercury that is about 760 mm high. The density of mercury = 13.6 g/cm3. The hydrostatic pressure is given by p = hρg, with h = 760 mm, ρ = 13.6 g/cm3, and g = 9.81 m/s2.

**Who invented mercury barometer?**

Evangelista Torricelli

The mercury barometer is the oldest type of barometer, invented by the Italian physicist Evangelista Torricelli in 1643. Torricelli conducted his first barometric experiments using a tube of water.

#### What is the average height of mercury?

The height of the mercury column serves as an indicator of atmospheric pressure. At sea level and at a temperature of 0° Celsius (C), the height of the mercury column is approximately 30 inches, or 76 centimeters.

**What will happen to the height of the mercury column if we take a barometer inside a deep pit trench?**

Below the earth’s surface, as we go deeper, the pressure increases. As the pressure outside the barometer increases, it starts pushing the mercury which inturn results in increase in the level of mercury column.

**What factors affect the height of mercury in the barometer?**

What are the factors which affect the height of Mercury in the Barometer? Some of the most important factors that affects the height of Mercury in the Barometer are: 1. Altitude: The density of air and the atmosphere above becomes less with height. Since pressure depends on weight, the atmospheric pressure also decreases with height.

## What happens to the vacuum when a mercury tube is tilted?

If the tube is titled as the mercury will occupy a longer length in the tube, but the vertical height (h) remains the same, since the atmospheric pressure has not changed. The vacuum in the tube, therefore, decreases. If the tube tilted, so that the vertical height is below h cm, the tube should be filled with mercury.

**What is the height of the mercury column used for?**

The height of the mercury column serves as an indicator of atmospheric pressure. At sea level and at a temperature of 0° Celsius (C), the height of the mercury column is approximately 30 inches, or 76 centimeters. This represents a pressure of approximately 14.7 psia. The 30-inch column is used as a reference standard.

**What happens if you touch a mercury column with CO2?**

Caution: Do not touch the bulb until it has warmed sufficiently for the mercury to emerge from the bulb into the capillary. Never subject the stem or mercury column to the CO 2 solution, as it will freeze the mercury column in the capillary and may cause the bulb to fracture.