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  2. Orders of magnitude (time) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(time)

    1 fs: The cycle time for ultraviolet light with a wavelength of 300 nanometres; The time it takes light to travel a distance of 0.3 micrometres (μm). 7.58fs: The period of vibration of a hydrogen molecule. 140 fs: The time needed for electrons to have localized onto individual bromine atoms 6 Ångstrom apart after laser dissociation of Br 2. [11]

  3. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    Used to measure the time between alternating power cycles. Also a casual term for a short period of time. centisecond: 10 −2 s: One hundredth of a second. decisecond: 10 −1 s: One tenth of a second. second: 1 s: SI base unit for time. decasecond: 10 s: Ten seconds (one sixth of a minute) minute: 60 s: hectosecond: 100 s: milliday: 1/1000 d ...

  4. List of time periods - Wikipedia

    en.wikipedia.org/wiki/List_of_time_periods

    The biggest Terekeme of the past into discrete, quantified named blocks of time is called periodization. [1] This is a list of such named time periods as defined in various fields of study. These can be divided broadly into prehistorical periods and historical periods (when written records began to be kept).

  5. Zeptosecond - Wikipedia

    en.wikipedia.org/?title=Zeptosecond&redirect=no

    Pages for logged out editors learn more. Contributions; Talk; Zeptosecond

  6. Attosecond - Wikipedia

    en.wikipedia.org/wiki/Attosecond

    An attosecond (abbreviated as as) is a unit of time in the International System of Units (SI) equal to 10 −18 or 11 000 000 000 000 000 000 (one quintillionth) of a second. [1] An attosecond is to a second, as a second is to approximately 31.69 billion years. [2]

  7. Timeline of human prenatal development - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_human_prenatal...

    Gestational age: 7 weeks and 0 days until 7 weeks and 6 days old. 50–56 days from last menstruation. Embryonic age: Week nr 6. 5 weeks old. 36–42 days from fertilization. The embryo measures 13 mm (1 ⁄ 2 in) in length. Lungs begin to form. The brain continues to develop. Arms and legs have lengthened with foot and hand areas distinguishable.

  8. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    This special time period is called "full term". [63] Whenever possible, waiting for labor to begin on its own in this time period is best for the health of the mother and baby. [17] The decision to perform an induction must be made after weighing the risks and benefits, but is safer after 39 weeks. [17] Events after 42 weeks are considered ...

  9. Calendar-based contraceptive methods - Wikipedia

    en.wikipedia.org/wiki/Calendar-based...

    Methods accepted by this church are referred to as natural family planning (NFP): so at one time, the term "the rhythm method" was synonymous with NFP. Today, NFP is an umbrella term that includes symptoms-based fertility awareness methods and the lactational amenorrhea method as well as calendar-based methods such as rhythm. [7]

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