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One billionth of a second. Time for molecules to fluoresce. shake: 10 −8 s: 10 nanoseconds, also a casual term for a short period of time. microsecond: 10 −6 s: One millionth of a second. Symbol is μs millisecond: 10 −3 s: One thousandth of a second. Shortest time unit used on stopwatches. jiffy (electronics) ~ 10 −3 s
A school period is a block of time allocated for lessons, classes in schools. [1] They typically last between 30 and 60 minutes, with around 3-10 periods per school day . However, especially in higher education, there can be many more.
A science project is an educational activity for students involving experiments or construction of models in one of the science disciplines. Students may present their science project at a science fair, so they may also call it a science fair project. Science projects may be classified into four main types.
1st grade Primary School: Second grade: 7–8 2nd grade Third grade: 8–9 3rd grade Fourth grade: 9–10 4th grade Fifth grade: 10–11 5th grade Sixth grade: 11–12 6th grade Seventh grade: 12–13 1st grade Gymnasium (Lower secondary school) (US equivalent: Middle school) Eighth grade: 13–14 2nd grade Ninth grade: 14–15 3rd grade Tenth ...
In the International System of Units (SI), the unit of time is the second (symbol: s). It has been defined since 1967 as "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom", and is an SI base unit. [12]
Period 4 includes the biologically essential elements potassium and calcium, and is the first period in the d-block with the lighter transition metals. These include iron , the heaviest element forged in main-sequence stars and a principal component of the Earth, as well as other important metals such as cobalt , nickel , and copper .