Health

Relaxation and good sleep key to managing high blood pressure

Mindfulness practices such as meditation and yoga should be recommended to people with high blood pressure, according to a comprehensive review of lifestyle changes that can help prevent and manage the condition, co-authored ...

Psychology & Psychiatry

'Nature prescriptions' can improve physical and mental health

Imagine that your doctor prescribes you a new treatment. It's pleasant and enjoyable, and you can have as much as you want. Potential side effects include spontaneous euphoria and being in a good mood. Not to mention, it's ...

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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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