| Status: |
STD 2005/06/07 |
| Code: |
234 |
| Symbol: |
W/m2 |
| EQ label: |
IRRADIANCE |
| |
| Quantities associated with this Unit |
|---|
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| Quantity: |
areic heat flow rate (density of heat flow rate)
|
| Concept definition: |
Φ/A, where Φ is heat flow rate [ISO 80000-5:2007, item 5-7] and A is area [ISO 80000-3:2006, item 3-3].
1 W/m2 = 1 kg/s3. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-5:2007, item 5-8.a] |
| Supplemental references: |
|
|
| Quantity: |
Poynting vector
|
| Concept definition: |
The cross product E x H, where E is electric field strength [IEC 80000-6:2008, item 6-10] and H is magnetic field strength [IEC 80000-6:2008, item 6-25]. |
| |
| Reference type: |
PR |
| Reference: |
[IEC 80000-6:2008, item 6-34.a] |
| Supplemental references: |
|
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| Quantity: |
spherical irradiance (radiant fluence rate)
|
| Concept definition: |
At a given point in space, the integral over Ω of L where dΩ is the solid angle [ISO 80000-3:2006, item 3-6] of each elementary beam passing through the given point and L its radiance [ISO 80000-7:2008, item 7-15] at that point in the direction of the beam. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-7:2008, item 7-16.a] |
| Supplemental references: |
|
|
| Quantity: |
radiant exitance
|
| Concept definition: |
At a point on a surface, dΦ/dA, where dΦ is the radiant flux [ISO 80000-7:2008, item 7-13] leaving an element of the surface with area dA [ISO 80000-3:2006, item 3-3]. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-7:2008, item 7-18.a] |
| Supplemental references: |
|
|
| Quantity: |
irradiance
|
| Concept definition: |
At a point on a surface, dΦ/dA, where dΦ is the radiant flux [ISO 80000-7:2008, item 7-19] incident on an element of the surface with area dA [ISO 80000-3:2006, item 3-6]. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-7:2008, item 7-19.a] |
| Supplemental references: |
|
|
| Quantity: |
sound intensity
|
| Concept definition: |
p ·v, where p is sound pressure [ISO 80000-5:2007, item 8-9.2] and v is sound particle velocity [ISO 80000-5:2007, item 8-11]. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-8:2007, item 8-17.a and item 8-17.1] |
| Supplemental references: |
|
|
| Quantity: |
energy fluence rate
|
| Concept definition: |
dΨ/dt, where dΨ is the increment of the energy fluence [ISO 80000-10:2009, item 10-47] during an infinitesimal time interval with duration dt [ISO 80000-3:2006, item 3-7]. |
| |
| Reference type: |
PR |
| Reference: |
[ISO 80000-10:2009, item 10-48.a] |
| Supplemental references: |
|
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