hectopascals to Inches of mercury conversion

What is a Hectopascal?

The hectopascal (hPa) is a 100 pascals (Pa). This is also known as millibar. The pascal is a SI unit that measures pressure. Pascal unit is named after Blaise Pascal and it replaced the previously used units for pressure $N/m^2$ in SI unit system. Following are equal representation of 1 Hectopascal in other units.

$$1\ hPa = 1\ millibar = \frac{100 *N}{m^2} = \frac{100 *kg}{m*s^2} = \frac{100 *J}{m^3}$$

Where
$N - Newtons$
$kg - Kilograms$
$m - Meters$
$s - Seconds$
$J - Jules$

Wikipedia page link for Pascal

What is inches of mercury?

Inches of mercury (inHg) is a unit of measurement used to express atmospheric pressure or the height of a column of mercury that would be exerting a given pressure.

In other words, it's a measure of how much pressure is being exerted on the atmosphere by gravity. The unit was originally defined as the pressure exerted by a column of mercury 1 inch (2.54 cm) high at sea level and at standard temperature (32°F/0°C).

To put it simply:

• 1 inch of mercury is equivalent to about 25.4 millimeters of mercury
• It's also equivalent to approximately 3386 pascals or 49.9 pounds per square inch

Inches of mercury are commonly used in weather forecasting, particularly for measuring the pressure of low-pressure systems such as hurricanes and typhoons. Weather forecasters often report barometric pressure using inches of mercury, especially when discussing tropical cyclones.

So, to summarize: inches of mercury is a unit of measurement that expresses atmospheric pressure or the height of a column of mercury exerting a given pressure!