FAQs
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Random FAQs
- No, definitely not.
- Mercury barometers must be firmly supported, made vertical and given time to adopt ambient temperature before attempting to use them.
- This is used for the coating on radiometers because, when applied in the appropriate manner, it is one of the lowest reflectance surfaces that exist.
- Yes it does - provide that you mean the 'scientific' definition of weight where the weight of a body is the gravitational force acting on it and hence it should be measured in newtons; this force depends on the local acceleration due to gravity.
- Pressure is not a base quantity but a derived quantity, with dimensions of length (L), mass (M) and time (T).
- The international definition of 'traceability' is the... property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons all having stated uncertainties.
- Yes it can in some circumstances but, where it does, it is fairly easy to ensure that its effect on the measurement uncertainties obtained is negligible.
- The purpose of this guidance note is to explain why it is not possible to claim formal traceability for the pressure measurements made by a pressure balance, at anywhere approaching state-of-the-art levels of measurement uncertainty, when such traceability is based on locally obtained dimensional measurements of individual pistons and cylinders.
- See the Pressure Units FAQs.
- The Rugby radio station, with call-sign GBR, was brought into service in 1926 by the Post Office as a telegraphy station with world-wide coverage and a frequency of 16 kHz.
All FAQs
- This is an arrangement amongst the majority of the world's National Metrology Institutes whereby each institute agrees to recognise measurement standards and calibration and measurement certificates issued by the other.
- This relates the different quality mixtures to each other.
- In 1799 it was agreed that the unit should be the mass of one cubic decimetre of water at a temperature of 4 °C, which would be called a kilogram (kg). The mass of one cubic centimetre of water would be called a gram (g).
- The solid-state 60 kHz transmitter at Anthorn typically operates at around 27 kW of radio-frequency signal which gives an equivalent monopole radiated power of approximately 17 kW.
- 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.
- The internationally agreed temperature is 20°C.
- To find the time in Hong Kong relative to the UK you need to know the time zone of Hong Kong and whether either country is on summer time (also known as daylight-saving time).
- Traceability is the property of a measurement or the value of a standard whereby it can be related to stated references.
- UKAS is the United Kingdom Accreditation Service.
- Its definition is not precise but, as mentioned in the section above, it is commonly taken to mean pressures below, and often considerably below, atmospheric pressure.