| Status: |
STD 2005/06/07 |
| Code: |
173 |
| Symbol: |
Pa |
| EQ label: |
PRESSURE |
| |
| Quantities associated with this Unit |
|---|
|
| Quantity: |
osmotic pressure
|
| Concept definition: |
The excess pressure required to maintain osmotic equilibrium between a solution and the pure solvent separated by a membrane permeable to the solvent only. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-9:2009, item 9-30.a] |
| Supplemental references: |
|
|
| Quantity: |
static pressure
|
| Concept definition: |
The pressure that would exist in the absence of sound waves. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-8:2007, item 8-9.a and item 8-9.1] |
| Supplemental references: |
|
|
| Quantity: |
pressure
|
| Concept definition: |
dF/dA, where dF is the force [ISO 80000-4:2006, item 4-9.1] component perpendicular to the surface element of area dA [ISO 80000-3:2006, item 3-3]. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-4:2006, item 4-15.a and item 4-15.1] |
| Supplemental references: |
[ISO 80000-1:2009, Table 2, "pressure, stress"] |
|
| Quantity: |
modulus of elasticity
|
| Concept definition: |
σ/ε where σ is normal stress [ISO 80000-4:2006, item 4-15.2] and ε is linear strain [ISO 80000-4:2006, item 4-16.1]. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-4:2006, item 4-18.a and item 4-18.1] |
| Supplemental references: |
|
|
| Quantity: |
sound pressure
|
| Concept definition: |
The difference between the instantaneous total pressure and the static pressure. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-8:2007, item 8-9.a and item 8-9.2] |
| Supplemental references: |
|
|
| Quantity: |
partial pressure of substance B
|
| Concept definition: |
For a gaseous mixture, pB = xB·p, where xB is the amount-of-substance fraction of substance B [ISO 80000-9:2009, item 9-14] and p is the total pressure [ISO 80000-4:2006, item 4-15.1]. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-9:2009, item 9-19.a] |
| Supplemental references: |
|
|
| Quantity: |
fugacity of substance B in a gaseous mixture
|
| Concept definition: |
pB, where for a gaseous mixture pB is proportional to the absolute activity, λB [ISO 80000-9:2009, item 9-18], the proportionality factor, which is a function of temperature only, being determined by the condition that, at constant temperature and composition, pB/pB tends to 1 for an indefinitely dilute gas. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-9:2009, item 9-20.a] |
| Supplemental references: |
|
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