Bar Converter
Convert Bar to Attopascal and more • 57 conversions
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Unit Explanations
Barbar
Source UnitThe bar is a metric unit of pressure, not part of the International System of Units (SI), but is commonly used in industry and meteorology. It is defined as exactly 100,000 pascals, which is slightly less than the average atmospheric pressure on Earth at sea level. One bar is equivalent to 0.987 atmospheres, 14.5038 pounds per square inch (psi), or 750.06 millimeters of mercury (mmHg). Although not an SI unit, it is accepted for use with the SI and is widely used due to its convenient size for many applications.
Current Use
The bar is widely used in various fields including meteorology for atmospheric pressure, and in industries such as automotive and aviation for tire pressure and cabin pressure monitoring. It is especially favored in contexts where moderate pressures need to be measured with a single-digit number, avoiding the unwieldy values that would result from using pascals.
Fun Fact
The bar is almost exactly the atmospheric pressure on Earth at sea level.
AttopascalaPa
Target UnitThe attopascal (aPa) is a subunit of pressure that is defined as one quintillionth of a pascal (Pa), which is the SI unit of pressure. Specifically, 1 attopascal equals 10^-18 pascals. The pascal itself is defined as one newton per square meter. This extremely small unit of pressure is utilized in high-precision scientific measurements, particularly in fields such as quantum physics and astrophysics, where minute variations in pressure can have significant implications.
Current Use
The attopascal is predominantly used in specialized scientific research and high-precision instruments. In fields such as quantum mechanics, it is essential for measuring the pressures achieved in ultrahigh vacuum environments, where the pressures can be exceptionally low. The attopascal is also relevant in astrophysics for studying the atmospheres of distant planets or the pressure conditions within stellar environments.
Fun Fact
The attopascal is so small that it is often used in theoretical physics rather than practical applications.
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= × 1.00000How to Convert
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Bar
pressure • Non-SI
Definition
The bar is a metric unit of pressure, not part of the International System of Units (SI), but is commonly used in industry and meteorology. It is defined as exactly 100,000 pascals, which is slightly less than the average atmospheric pressure on Earth at sea level. One bar is equivalent to 0.987 atmospheres, 14.5038 pounds per square inch (psi), or 750.06 millimeters of mercury (mmHg). Although not an SI unit, it is accepted for use with the SI and is widely used due to its convenient size for many applications.
History & Origin
The bar as a unit of pressure was introduced in the early 20th century. It was created to provide a convenient metric unit for expressing pressures without having to resort to using large numbers, as can occur with the pascal. The bar was defined in 1909 by the International Union of Pure and Applied Chemistry (IUPAC) to be equivalent to 100,000 pascals, simplifying conversion with the SI system.
Etymology: The word 'bar' comes from the Greek word 'baros', meaning weight.
Current Use
The bar is widely used in various fields including meteorology for atmospheric pressure, and in industries such as automotive and aviation for tire pressure and cabin pressure monitoring. It is especially favored in contexts where moderate pressures need to be measured with a single-digit number, avoiding the unwieldy values that would result from using pascals.
💡 Fun Facts
- •The bar is almost exactly the atmospheric pressure on Earth at sea level.
- •The unit 'bar' is not an SI unit, but it's accepted for use with SI due to its practicality.
- •The word 'barometer', an instrument for measuring atmospheric pressure, shares its root with the unit 'bar'.
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Attopascal
pressure • Non-SI
Definition
The attopascal (aPa) is a subunit of pressure that is defined as one quintillionth of a pascal (Pa), which is the SI unit of pressure. Specifically, 1 attopascal equals 10^-18 pascals. The pascal itself is defined as one newton per square meter. This extremely small unit of pressure is utilized in high-precision scientific measurements, particularly in fields such as quantum physics and astrophysics, where minute variations in pressure can have significant implications.
History & Origin
The attopascal was introduced to provide a more convenient way to express extremely low pressures that are relevant in certain scientific fields. The pascal, named after the French mathematician and physicist Blaise Pascal, was adopted as the SI unit for pressure in 1971. The prefix 'atto-' is derived from the Greek word 'atto', meaning 'eighteen', and was officially added to the International System of Units in 1960. This prefix allows scientists to express measurements of pressure that are otherwise cumbersome at such low values.
Etymology: The term 'attopascal' combines the prefix 'atto-', representing 10^-18, with 'pascal', the unit of pressure.
Current Use
The attopascal is predominantly used in specialized scientific research and high-precision instruments. In fields such as quantum mechanics, it is essential for measuring the pressures achieved in ultrahigh vacuum environments, where the pressures can be exceptionally low. The attopascal is also relevant in astrophysics for studying the atmospheres of distant planets or the pressure conditions within stellar environments.
💡 Fun Facts
- •The attopascal is so small that it is often used in theoretical physics rather than practical applications.
- •One attopascal is equivalent to less than one billionth of a standard atmospheric pressure.
- •The prefix 'atto-' was derived from the Danish word 'at', meaning 'eighteen', reflecting its power of ten.
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