mercury only liquid metal standard temperature pressure

Mercury is the only metal that is liquid under standard conditions

Mercury is the only metal that is liquid at standard temperature and pressure. Its atoms hold one another unusually weakly, partly because effects from relativity change the behavior of its outer electrons.

Tunguska-scale asteroid airbursts are rare

Asteroid airbursts occur regularly, but an event on the scale of Tunguska is estimated to happen only about once every thousand years. Tunguska-scale events are roughly 5–15 megatons; air bursts of about five kilotons are estimated to happen about once a year.

Taiwan has fewer births and more older residents

Taiwan’s fertility rate is below 0.8 births per woman, and more than 20% of its population is 65 or older. A shrinking workforce must support a growing elderly population. Falling births are also contributing to school closures and labor shortages.

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mercury only liquid metal standard temperature pressure

Mercury is the only metal that is liquid under standard conditions

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