There is so much for visitors to see and do when visiting Brisbane, Queensland, Australia. Certainly there is never time to ever feel bored; this city is a mine of interesting information. One of the sights to definitely pay a visit to is the Sir Thomas Brisbane Planetarium, which offers informative and delightful programs for […]
The eye behaves like a camera with the lens focusing light onto the retina rather than the film or image sensor. The retina converts light into impulses that travel up the optic nerve to the brain.
Hypoxia literally means “deficient in oxygen”. Hypoxia is a shortage of oxygen in the body. Hypoxia is a pathological condition in which the body as a whole (generalized hypoxia) or a region of the body (tissue hypoxia) is deprived of adequate oxygen supply. Variations in arterial oxygen concentrations can be part of the normal physiology, […]
In the troposhere temperature tends to decrease as height increases. In the theoretical International Standard Atmosphere the temperature decrease or ‘lapse rate’ is defined as 1.98oC per 1000 feet gain in altitude. Like most things theoretical this doesn’t always happen in practice.
Pibals are small helium filled balloons that balloon pilots use to help assess the winds aloft. By knowing the empty weight of the balloon and its inflated diameter you can use the table below to estimate a pibals ascent rate.
This article describes the procedure to calculate air density given the temperature, dewpoint and pressure or temperature, pressure and relative humidity. Included on the page are online calculators.