1. What is the Atm to mmHg Conversion?

The conversion between atmospheres (atm) and millimeters of mercury (mmHg) is a fundamental pressure unit conversion. 1 atmosphere is defined as exactly 760 mmHg at standard temperature and pressure conditions.

2. How Does the Calculator Work?

The calculator uses the simple conversion formula:

Where:

• \( mmHg \) — Millimeters of mercury
• \( atm \) — Atmospheres
• 760 — Conversion factor (exact value)

Explanation: This is a direct conversion factor defined by the relationship between these two pressure units.

3. Importance of Pressure Conversion

Details: Accurate pressure conversion is crucial in fields like meteorology, aviation, medicine (especially blood pressure measurements), and various scientific experiments where different pressure units are used.

4. Using the Calculator

Tips: Enter the pressure value in atmospheres (atm). The value must be positive. The calculator will instantly convert it to millimeters of mercury (mmHg).

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor exactly 760?
A: This is based on the standard atmospheric pressure defined as the pressure exerted by a 760 mm column of mercury at 0°C at standard gravity.

Q2: What is the relationship between mmHg and other pressure units?
A: 1 atm = 760 mmHg = 101325 Pa = 1013.25 hPa = 14.6959 psi

Q3: Is mmHg the same as torr?
A: For most practical purposes, yes (1 mmHg ≈ 1 torr). The difference is less than 0.000015%.

Q4: Why is mmHg still used today?
A: Despite the SI unit being pascal, mmHg remains widely used in medicine (blood pressure) and meteorology due to historical conventions and practical measurement considerations.

Q5: How precise is this conversion?
A: The 760 conversion factor is exact by definition, so the conversion is mathematically precise.