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Chapter 1

Units, Dimensions, and Measurements

check_url/de/science-education-library/2010/units-dimensions-and-measurements/
Physics is concerned with the interactions of energy, matter, space, and time, in order to discover the underlying mechanisms that underpin all phenomena. …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
The order of magnitude of a number is the power of 10 that most closely approximates it. Thus, the order of magnitude estimates the scale (or size) of its …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
Scientists frequently use models to help them comprehend a specific collection of phenomena. In physics, a model is a condensed version of a physical …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
In any system of units, the units for some physical quantities must be specified through a measurement process. These measurements are the base quantities …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
Sometimes, there is a need to convert from one unit to another one. For instance, reading a cookbook in which quantities are expressed in units of liters …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
In any measurement, the precision of the measuring tool is an essential factor. An ordinary ruler, for example, can measure length to the closest …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
Uncertainty in measurements can be avoided by reporting the results of a calculation with the correct number of significant figures. This can be …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
The concept of dimension is important because every mathematical equation linking physical quantities must be dimensionally consistent, implying that …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
Every mathematical equation that connects separate distinct physical quantities must be dimensionally consistent, which implies it must abide by two …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
Problem-solving is the ability to apply general physical principles to specific situations, usually expressed by equations. It is an essential skill in …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
Light interacts with an organism’s integument on a variety of spatial scales. For example in an iridescent bird: nano-scale structures produce color; the …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
Steels are commonly used materials in the fabrication of vacuum systems because of their good mechanical, corrosion, and vacuum properties. A variety of …
check_url/de/science-education-library/2010/units-dimensions-and-measurements/
A technique to measure the temperature of water and non-turbid aqueous media surrounding an induction-heated small magnetic sphere is presented. This …