Like the proverbial canary in a coal mine, the nearly 10, 000 known bird species act as "environmental barometers" whose populations can appraise the greater well-being of their habitats.
Elemental mercury, or quicksilver, is a shiny, silvery liquid metal found in thermometers, thermostats, light bulbs, barometers and LCD screens.
Fixed cistern barometers are used as a standard for checking.
Fixed cistern barometers are used as a standard for checking aneroid barometers.
Such instruments as thermometers and barometers can be found in any physics laboratory.
Torricelli's work on water barometers showed that the pressure of the atmosphere could balance a column of water just over 30 feet in height.
Whatever else life throws in your way, these are the barometers by which you can measure your progress in the world and how you are reacting to change.
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