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The standard unit of length in both the SI and original metric systems is the meter (m). A meter was originally specified as 1/10,000,000 of the distance from the North Pole to the equator. It is now defined as the distance light in a vacuum travels in 1/299,792,458 of a second.
- Measurements in The Laboratory
Measure the dimensions of the block. If it is a cube or a...
- Measurements in The Laboratory
Each distance can be expressed using the meter unit, so volume has the derived unit m × m × m, or m 3 (read as “meters cubed” or “cubic meters”). A cubic meter is a rather large volume, so scientists typically express volumes in terms of 1/1,000 of a cubic meter.
15 Οκτ 2022 · Measure the dimensions of the block. If it is a cube or a rectangular box, measure its length, width and height. If it is a cylinder or cone, measure its height and the diameter of its circular base. Return the block or cylinder and ruler to the front bench when finished.
14 Νοε 2022 · The SI base Units. In principle, any physical quantity can be expressed in terms of only seven base units. Each base unit is defined by a standard which is described in the NIST Web site. The SI base units. length. meter. mass. kilogram. kg.
Explain the process of measurement. Identify the three basic parts of a quantity. Describe the properties and units of length, mass, volume, density, temperature, and time. Perform basic unit calculations and conversions in the metric and other unit systems.
As another example, consider the potential energy of an object in the gravitational field of the earth at a height h above the earth’s surface. = mgh, where g is the acceleration due to gravity, 9.8 ms−2. units calculation would therefore give: = (kg) (ms−2) (m) = kg m2 s−2.
Every measurement provides three kinds of information: the size or magnitude of the measurement (a number); a standard of comparison for the measurement (a unit); and an indication of the uncertainty of the measurement.
