Measuring instrument

related topics
{math, energy, light}
{acid, form, water}
{system, computer, user}
{rate, high, increase}
{work, book, publish}
{math, number, function}

In the physical sciences, quality assurance, and engineering, measurement is the activity of obtaining and comparing physical quantities of real-world objects and events. Established standard objects and events are used as units, and the process of measurement gives a number relating the item under study and the referenced unit of measurement. Measuring instruments, and formal test methods which define the instrument's use, are the means by which these relations of numbers are obtained. All measuring instruments are subject to varying degrees of instrument error and measurement uncertainty.

Scientists, engineers and other humans use a vast range of instruments to perform their measurements. These instruments may range from simple objects such as rulers and stopwatches to electron microscopes and particle accelerators. Virtual instrumentation is widely used in the development of modern measuring instruments.

Contents

related documents
Planetary nebula
Gravitation
Comet Hale-Bopp
Stimulated emission
Solar wind
Fine-structure constant
Inertial frame of reference
T-symmetry
Magnetometer
Centimetre gram second system of units
Magnetism
Escape velocity
Electromagnet
Elastic collision
Antimatter
Antiparticle
Trans-Neptunian object
Hipparchus
Wave–particle duality
Phase transition
Conservation of energy
Michelson–Morley experiment
Mass
Tidal locking
Longitude
Galaxy formation and evolution
Dyson sphere
Tidal acceleration
Asteroid
Interstellar medium