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Related Concept Videos

Uncertainty: Overview00:59

Uncertainty: Overview

In analytical chemistry, we often perform repetitive measurements to detect and minimize inaccuracies caused by both determinate and indeterminate errors. Despite the cares we take, the presence of random errors means that repeated measurements almost never have exactly the same magnitude. The collective difference between these measurements - observed values - and the estimated or expected value is called uncertainty. Uncertainty is conventionally written after the estimated or expected value.
Anxiety: Overview01:18

Anxiety: Overview

Anxiety is a common mental disorder featuring excessive worry, fear, and apprehension, significantly affecting daily life. People with anxiety disorders experience persistent and intense anxiety, interrupting their everyday functioning.
Individuals with anxiety often experience a range of physical and emotional symptoms, including sweating, trembling, tachycardia, and disturbances in sleep patterns. These symptoms vary in intensity and frequency but are generally disruptive and distressing.
Uncertainty: Confidence Intervals00:54

Uncertainty: Confidence Intervals

The confidence interval is the range of values around the mean that contains the true mean. It is expressed as a probability percentage. The interpretation of a 95% confidence interval, for instance, is that the statistician is 95% confident that the true mean falls within the interval. The upper and lower limits of this range are known as confidence limits. The confidence limits for the true mean are estimated from the sample's mean, the standard deviation, and the statistical factor 't,' or...
Unrealistic Optimism Bias01:30

Unrealistic Optimism Bias

Unrealistic optimism bias is the tendency to overestimate the likelihood of positive outcomes. This cognitive bias makes individuals believe they are less likely to experience failures, setbacks, or risks and more likely to succeed than others. For example, people may assume they are less prone to health issues, accidents, or financial struggles than their peers, even when they share similar risk factors.One key component of this bias is the above-average effect, where individuals perceive...
Masking and Demasking Agents01:19

Masking and Demasking Agents

EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...
Energy00:58

Energy

The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate from the Sun—the ultimate energy source. For instance, plants capture light energy from the Sun, and through the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal...

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Related Experiment Video

Updated: Jul 12, 2026

Experimental Research Examining How People Can Cope with Uncertainty Through Soft Haptic Sensations
09:07

Experimental Research Examining How People Can Cope with Uncertainty Through Soft Haptic Sensations

Published on: September 16, 2015

Relaxed energy outlook masks continuing uncertainties.

H H Landsberg

    Science (New York, N.Y.)
    |December 3, 1982
    PubMed
    Summary

    The U.S. energy situation has improved, but challenges persist. Continued scrutiny of energy future assumptions is vital, as current ease may reflect economic downturns.

    Area of Science:

    • Energy Policy
    • National Security

    Background:

    • The U.S. faced a significant energy crisis 9 years ago.
    • Recent improvements in the energy situation have been observed.

    Purpose of the Study:

    • To critically evaluate the U.S. energy situation.
    • To scrutinize assumptions underlying optimistic energy future prognoses.

    Main Methods:

    • Analysis of the current U.S. energy landscape.
    • Review of underlying assumptions for future energy projections.

    Main Results:

    • Energy situation has improved, but not fully resolved.
    • Current energy ease is partly linked to economic depression.
    • Some optimistic energy future assumptions are questionable.

    Related Experiment Videos

    Last Updated: Jul 12, 2026

    Experimental Research Examining How People Can Cope with Uncertainty Through Soft Haptic Sensations
    09:07

    Experimental Research Examining How People Can Cope with Uncertainty Through Soft Haptic Sensations

    Published on: September 16, 2015

    Conclusions:

    • While U.S. energy conditions have eased, fundamental problems remain.
    • Continuous evaluation of energy policies and economic factors is necessary.
    • Overconfidence in a carefree energy future is unwarranted.