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- The best thermometer to use in a particular application is something that only you can decide. Your choice will depend on many factors and a selection of these is listed below.
- A thermometer is a device which has a measurable property which changes with temperature.
- Liquid-in-glass thermometers can be used in varying ranges from around - 200°C to +600°C. In calibrating a liquid-in-glass thermometer one must consider the thermometer itself, the environment used for the calibration, and the standards used to provide the reference temperature.
- A thermistor is simply an electrical resistor whose resistance changes rapidly with temperature.
- No, ultimately it is less accurate. Liquid depth can be determined from pressure measurements and the reason can be seen by looking at the fundamental (and simplified) equation for calculating the pressure at a particular depth in a liquid.
- Instrument calibration is often thought to be expensive but the information contained in the resultant certificate is usually worth considerably more. This is not always appreciated and, on receipt, many certificates are wastefully consigned to drawers, shelves or even wall plaques.
- Platinum-iridium was chosen as the material for the kilogram for a number of reasons.
- The MSF time signal provides a good service throughout the British Isles, with signal strengths greater than 100 µV/m at 1000 km from Anthorn (in Cumbria) in all directions.
- A millennium is any period of a thousand years. So you could say that the next millennium begins now. The third millennium of the Christian Era began at the start of the year 2001 A.D.
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- Platinum-iridium was chosen as the material for the kilogram for a number of reasons.
- Many old pressure units have obvious practical and historical origins; for example, inches of water was the unit used where pressures were measured with a water column whose top surface was sighted against an inch scale.
- Discussions in Europe under the MERA project are pointing in the direction of this alternative to a single world or European institute, but some duplication and collaboration will probably always be required.