AcuRite 00795A2 Galileo Thermometer with Glass Globe Barometer, Barometer Set, Glass/Wood

Product Information

The process can become uncomfortable and special attention must be given to ensuring hygienic conditions. The thermometer consists of a glass tube filled with a clear liquid, in which colored glass spheres float. The bubbles are calibrated by adding a certain amount of fluid to them so that they have the exact same density. While it will not indicate exact barometric pressure in numerical values, it is still regarded as an accurate monitor of air pressure changes. Carefully weighted glass globes are suspended in a liquid-filled tube, where they sedately sink or float as the surrounding air gets hotter or colder.

Since the green bubble is calibrated to represent 70 degrees, the same temperature as the water, it sinks slightly so that it is floating just below the purple and red bubbles -- thereby indicating the room's temperature!If you have never used one like this as you rotate the thermometer between your fingers look between the black arrows toward the base and the silver line becomes visible. If you have read this question, then you know that an object immersed in a fluid experiences two major forces: the downward pull of gravity and the upward push of buoyancy. A rising glass sphere indicates a fall in temperature, whereas a rise in temperature is indicated by a falling glass sphere.

A Goethe weather ball barometer is a device that predicts barometric weather changes by observing the rise and fall of liquid within the spout of a vented glass vessel. Since the surrounding air is 70 degrees, we know the water inside the thermometer is also about 70 degrees. Anne has been teaching high school chemistry for over 20 years and is passionate about providing accessible and educational chemistry content. New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging . It contains small glass vessels of varying densities which rise or fall throughout the day to indicate the temperature.Using a beaker of water is great for a classroom demonstration because the temperature change between the air and the water makes for a dramatic show. Thermometer containing several glass vessels of varying density A Celsius Galilean thermometer in two degree gradations. I didn’t pay much attention to the dimensions, just imagining it would be the same size as other thermometers I’ve seen before.