// multi-utility computation suite · offline · instant · precise
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sci.cryogenic-boil-off Calculator
Calculates cryogenic liquid boil-off rate from heat leak through vacuum insulation, supports, and vent lines using Q = U × A × ΔT. LN₂ boil-off from a 1,000-litre Dewar with 1 W total heat leak: 0.54 kg/day — well-designed cryostats achieve < 0.1 W/litre/day heat leak.
Inputs
Heat Flux W M2
Reference formula or conversion factor shown for context.
Tank Surface M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Hvap Kj Kg
Reference formula or conversion factor shown for context.
Fluid Density Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Tank Volume M3
Three-dimensional space occupied (m³ or L). 1 m³ = 1,000 L.
Results
boil-off rate (% per day)
The value at the specified point or condition.
mass boil-off (kg/day)
The computed mass of the object or substance.
heat ingress Q (W)
The value at the specified point or condition.
LH₂ reference
Sample size or count used in the calculation.
LN₂ reference
Sample size or count used in the calculation.
aerospace storage
Reference formula or conversion factor shown for context.