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Related Concept Videos

Range00:59

Range

14.3K
The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
15.9; 16.1; 15.2; 14.8; 15.8; 15.9; 16.0; 15.5
Measurements of the amount of soda in a 16-ounce can vary since different subjects record these measurements or since the exact amount - 16 ounces of liquid, was not...
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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Variation: Normal Distribution, Range, and Standard Deviation02:32

Variation: Normal Distribution, Range, and Standard Deviation

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In the field of psychology, there are several ways to organize measurements of a trait, feature, or characteristic (i.e., variables). Qualitative data, such as ethnicity, can be tabulated into a frequency count to provide information about the proportion, as well as the variety of groups in a sample or population. On the other hand, researchers can perform a wider set of calculations on quantitative data. The mean, mode, and median, for instance, are central tendency measures to identify a...
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Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Gravitational Potential Energy for Extended Objects01:07

Gravitational Potential Energy for Extended Objects

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Consider a system comprising several point masses. The coordinates of the center of mass for this system can be expressed as the summation of the product of each mass and its position vector divided by the total mass:
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Range Rule of Thumb to Interpret Standard Deviation01:13

Range Rule of Thumb to Interpret Standard Deviation

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The range rule of thumb in statistics helps us calculate a dataset's minimum and maximum values with known standard deviation. This rule is based on the concept that 95% of all values in a dataset lie within two standard deviations from the mean.
For instance, the range rule of thumb can be used to find the tallest and the shortest student in a class, given the mean student height and standard deviation. If the mean student height is 1.6 m and the standard deviation, s is 0.05 m, the height...
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Extended visual range during solar eclipses.

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    Summary
    This summary is machine-generated.

    During a solar eclipse, visual range unexpectedly increased, allowing distant mountains to be seen through wildfire smoke. This phenomenon is linked to reduced scattered light near totality, enhancing visibility.

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    Area of Science:

    • Atmospheric optics
    • Astronomy
    • Meteorology

    Background:

    • Wildfire smoke significantly reduced visual range during the 2017 solar eclipse.
    • Distant mountain ranges were obscured by atmospheric haze for most of the eclipse observation period.

    Purpose of the Study:

    • To document and explain the enhanced visual range observed during a solar eclipse.
    • To investigate the effect of changing light conditions on atmospheric visibility.

    Main Methods:

    • Photographic documentation of the Grand Teton mountain range during the solar eclipse.
    • Development of a simple model for daytime visual range based on air light ratios.

    Main Results:

    • Photographic evidence confirmed extended visual range (80-90 km) near solar totality.
    • The visual range increased when the ratio of nearby to distant air light decreased, improving contrast.

    Conclusions:

    • The study demonstrates that reduced scattered light during a solar eclipse can significantly enhance visual range.
    • Similar visibility enhancements may occur under conditions of deep shade, such as heavy cloud cover.