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  2. Observation - Wikipedia

    en.wikipedia.org/wiki/Observation

    Observation in the natural sciences [1] is an act or instance of noticing or perceiving [2] and the acquisition of information from a primary source. In living beings, observation employs the senses. In science, observation can also involve the perception and recording of data via the use of scientific instruments. The term may also refer to ...

  3. List of unsolved problems in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Protein folding problem: Is it possible to predict the secondary, tertiary and quaternary structure of a polypeptide sequence based solely on the sequence and environmental information? Inverse protein-folding problem: Is it possible to design a polypeptide sequence which will adopt a given structure under certain environmental conditions?

  4. Observer effect (physics) - Wikipedia

    en.wikipedia.org/wiki/Observer_effect_(physics)

    In physics, the observer effect is the disturbance of an observed system by the act of observation. [1] [2] This is often the result of utilising instruments that, by necessity, alter the state of what they measure in some manner. A common example is checking the pressure in an automobile tire, which causes some of the air to escape, thereby ...

  5. Quantitative analysis (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Quantitative_analysis...

    The general expression Qualitative Analysis [...] refers to analyses in which substances are identified or classified on the basis of their chemical or physical properties, such as chemical reactivity, solubility, molecular weight, melting point, radioactivity properties (emission, absorption), mass spectra, nuclear half-life, etc. Quantitative Analysis refers to analyses in which the amount ...

  6. Outline of science - Wikipedia

    en.wikipedia.org/wiki/Outline_of_science

    The following outline is provided as a topical overview of science; the discipline of science is defined as both the systematic effort of acquiring knowledge through observation, experimentation and reasoning, and the body of knowledge thus acquired, the word "science" derives from the Latin word scientia meaning knowledge. A practitioner of ...

  7. Observer bias - Wikipedia

    en.wikipedia.org/wiki/Observer_bias

    This is a common occurrence in the everyday lives of many and is a significant problem that is sometimes encountered in scientific research and studies. [3] Observation is critical to scientific research and activity, and as such, observer bias may be as well. [ 4 ]

  8. Collapsing can - Wikipedia

    en.wikipedia.org/wiki/Collapsing_can

    Crushed Coca Cola's aluminum can. Collapsing can or can crusher experiment is a demonstration of an aluminum can being crushed by atmospheric pressure.Due to the low pressure inside a can as compared to the pressure outside, the pressure outside exerts a force on the can causing the can to collapse.

  9. Bredt's rule - Wikipedia

    en.wikipedia.org/wiki/Bredt's_rule

    In organic chemistry, an anti-Bredt molecule is a bridged molecule with a double bond at the bridgehead. Bredt's rule is the empirical observation that such molecules only form in large ring systems. For example, two of the following norbornene isomers violate Bredt's rule, and are too unstable to prepare: Bridgehead atoms violating Bredt's ...

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