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[159] 8.5 × 10 16 Bq equals 24 kilograms of caesium-137. [159] Cs-137 has a half-life of 30 years. [2] Tellurium-132, half-life 78 hours, an estimated 1150 PBq was released. [2] An early estimate for total nuclear fuel material released to the environment was 3 ± 1.5 %; this was later revised to 3.5 ± 0.5 %. This corresponds to the ...
In statistics, explained variation measures the proportion to which a mathematical model accounts for the variation of a given data set. Often, variation is quantified as variance ; then, the more specific term explained variance can be used.
The study found that for every hour that babies 8–16 months of age watched DVDs and videos, they knew 6-8 fewer of 90 common baby words than the babies that did not watch them. Andrew Meltzoff, a surveyor in this study, states that the result makes sense, that if the baby's "alert time" is spent in front of DVDs and TV, instead of with people ...
For example, many weekday newspaper puzzles (such as the American New York Times crossword puzzle) are 15×15 squares, while weekend puzzles may be 21×21, 23×23, or 25×25. The New York Times puzzles also set a common pattern for American crosswords by increasing in difficulty throughout the week: their Monday puzzles are the easiest and the ...
The time to reach equilibrium depends on parameters such as temperature, pressure, and the materials involved, and is determined by the minimum free energy. In equilibrium, the Gibbs free energy of reaction must be zero. The pressure dependence can be explained with the Le Chatelier's principle. For example, an increase in pressure due to ...
Mass extinctions are characterized by the loss of at least 75% of species within a geologically short period of time (i.e., less than 2 million years). [18] [51] The Holocene extinction is also known as the "sixth extinction", as it is possibly the sixth mass extinction event, after the Ordovician–Silurian extinction events, the Late Devonian extinction, the Permian–Triassic extinction ...
The threshold for the wealthiest 1% was approximately $8.4 million measured for the 2008–2010 period. Nearly half the top 1% by income were also in the top 1% by wealth. [292] In 2010, the wealthiest 5% of households owned approximately 72% of financial wealth, while the bottom 80% of households had 5%. [293]
Ozone (/ ˈ oʊ z oʊ n /) (or trioxygen) is an inorganic molecule with the chemical formula O 3.It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O