Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Estimated uncertainties of 1976 NBS gas thermometer
| Feature | Uncertainty |
|---|---|
| Dead space | 0.9 mK (C) |
| Thermal expansion | 0.5 mK (B) |
| Pressure ratio | 0.5 mK (A) |
| 0.4 mK (B) | |
| Gas imperfection | 1.2 mK (C) |
| Thermomolecular | Negligible |
Three classes of uncertainty were recorded, all in terms of “one standard deviation”:
A. Random errors.
B. Errors producing a constant bias but evaluable in terms of random errors of subsidiary experiments.
C. Systematic errors not evaluable in statistical terms.
