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unit of measure: the base unit | the supplementary unit | the derived unit

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unit

Heat flux density

thermal flux

Definition

The heat flux density or thermal flux is the physical measure, which defines the thermal flux passing through an isotherm area.

1 watt per square metre is the heat flux density or thermal flux of 1 watt, evenly distributed over an area of 1 square meter.

 

system of units:   SI;
statute:   derived unit;
name the value:   q;
unit name:   watt per square metre;
symbol unit:   W/m²;
relationship of definition:   q = P/S;
dimension:   M T-3;
expression in other units:   erg/(cm²·s), W/in;

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Units of measurement

namesymbol value in SI unit:
W/m²
note
1 watt per square centimetre W/cm²= 104 
1 watt per square inch W/in²≈ 1 550.003 
1 erg per centimeter square second erg/(cm²·s)= 0.001 
1 BtuIT per square foot hourBtuIT/(ft² h)≈ 3.154 591(1), (2)
1 BtuIT per square foot minuteBtuIT/(ft² min)≈ 189.275 46(1), (2)
1 BtuIT per square foot secondBtuIT/(ft² s)≈ 11 356.528(1), (2)
1 Btuth per square foot hourBtuth/(ft² h)≈ 3.152 481(1), (3)
1 Btuth per square foot minuteBtuth/(ft² min)≈ 189.148 9(1), (3)
1 Btuth per square foot secondBtuth/(ft² s)≈ 11 348.89(1), (3)
1 Btuth per square inch hourBtuth/(in² h)≈ 453.957 (2)(1), (3)
1 Btuth per square inch minuteBtuth/(in² min)≈ 27 237.4(3)(1), (3)
1 Btuth per square inch second Btuth/(in² s)≈ 1 634 246(1), (3)
1 calorieth per square centimeter hour calth/(cm²;·h)≈ 11.6(2)(3)
1 calorieth per square centimeter minute calth/(cm²;·min)≈ 6.97(3)(3)
1 calorieth per square centimeter second calth/(cm²;·s)= 41 840(3)

Note:

(1) - Btu - British thermal unit;

(2) - IT - common unit, international;

(3) - th - thermochemical unit;