Table 1. Relative and combined standard uncertainty of Platinum at the melting point

Contributing factors (%)	ISS-ELF	NASA MSFC ESL
Uncertainty of temperature: u(T) / T	1.83	0.76
Uncertainty of mass: u(m) / m	0.20	0.33
Uncertainty of radius: u(r) / r	0.50	0.48
Uncertainty of volume: u(V) / V	1.51	1.46
Uncertainty of volume slope: u(∂V / ∂T) / ∂V / ∂T	4.29	4.23
Uncertainty of frequency: u(fn) / fn	-	0.67
Uncertainty of time constant: u(τn) / τn	-	2.81
Combined standard uncertainty of density: uc(ρ) / ρ	1.53	1.49
Combined uncertainty of CTE: uc(β) / β	4.55	4.48
Combined uncertainty of surface tension: uc(σ) / σ	-	1.38
Combined uncertainty of viscosity: uc(η) / η	-	3.33

ISS, International Space Station; ELF, Electrostatic Levitation Furnace; MSFC, Marshall Space Flight Center; ESL, electrostatic levitation; CTE, thermal expansion coefficient.