Measuring and modeling methane emissions in wetlands

Global atmospheric methane concentrations have risen steadily since 2006. Growth in agriculture, transportation, and industry are partly to blame, but so too is the rise in biogenic emissions, or emissions from natural sources.

Study predicts best times for Curiosity to sample Mars' methane

Since methane was first detected in Mars' atmosphere 20 years ago, scientists have struggled to uncover its origins and how it is transported around the Red Planet. Measurements from atmospheric samples collected by NASA's ...

NASA selects a sample return mission to Venus

In Dante Alighieri's epic poem The Divine Comedy, the famous words "Abandon all hope, ye who enter here" adorn the gates of hell. Interestingly enough, Dante's vision of hell is an apt description of what conditions are like ...

Shape-shifting protein study could advance new drug development

Proteins do the heavy lifting of performing biochemical functions in our bodies by binding to metabolites or other proteins to complete tasks. To do this successfully, protein molecules often shape-shift to allow specific ...

Newly created ultra-hard material rivals diamond

Scientists have solved a decades-long puzzle and unveiled a near unbreakable substance that could rival diamond as the hardest material on Earth. The research is published in the journal Advanced Materials.

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Atmospheric pressure

Atmospheric pressure is sometimes defined as the force per unit area exerted against a surface by the weight of air above that surface at any given point in the Earth's atmosphere. In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. Low pressure areas have less atmospheric mass above their location, whereas high pressure areas have more atmospheric mass above their location. Similarly, as elevation increases there is less overlying atmospheric mass, so that pressure decreases with increasing elevation. A column of air one square inch in cross-section, measured from sea level to the top of the atmosphere, would weigh approximately 65.5 newtons (14.7 lbf). The weight of a 1 m2 (11 sq ft) column of air would be about 101 kN (10.3 tf).

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