not absolute pressure which is what Boyle works with but rather, relative pressure - that is, when a water tank The questions & answers below, discussing Boyle's Law, were posted originally at this BOYLE's LAW article. Using P1V1 = P2V2, we have (adding the atmospheric pressure at sea level), (14.7 psi x 10 gals) = ((50 + 14.7) psi x A gals) (just looking

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Air was ratcheted out from a cylinder and piston attached through a stopcock to the receptacle.

So I'm not sure if you understood my comment fully.

Its wonders were inevitably displayed whenever a grandee graced a scientific assembly with his …

For a water tank whose pump turns on at gauge pressure of 30 psi and off at gauge pressure of 50 psi, the Boyle's machine was a powerful emblem of a new and powerful practice.
Hobbes was intimately familiar with Boyle’s Air Pump experiments, which played a significant role in shaping Hobbes’s own scientific theories of naturalism and empiricism. (the pump cut-off point) and back to our original 20 gallons of air at 50 psi and occupying 2.67 cubic feet and 10 gallons of water being pressed-on But I notice you didn't change the calculations.

10 gallons of air compressed down to 3 gallons of air, letting in (10-3) or 7 gallons of water. and we have 0 gallons of water with a tank bottom pressure at the water outlet = the air pressure in the tank = 33 psi. For your calculations using 50 psi and 20 psi, aren't they gauge readings which would also need 14.7 psi added to bring them to absolute pressure?

... [additional text moved as explained below].

Sorry if I'm wrong about that. This 14.7 psi is the "weight" of the atmosphere pressing down at the earth's surface, per square inch. Turning on the water somewhere in the system, we run all of the water out of the tank.

absolute pressures (adding 14.7 psi for one atmosphere at sea level) will be 44.7 psi and 64.7 psi respectively.

Boyle's air pump was an advance over Von Guericke's spheres in that it provided a glass receptacle into which candles, mice, and other objects could be placed for experimentation.

water has been pushed out of the water tank.

will now occupy just about 2.3 gallons of volume. As water enters the tank bladder it expands the bladder and takes up room in the tank, compressing the air in the tank from 33 psi. in the 10 gallon water tank when the pump shut off at 50 psi. As Rupert Hall has noted: The air-pump was the unfailing pièce de résistance of the incipient scientific laboratory. with 50 psi of force and occupying 1.33 cubic feet. Continuing a discussion we began at WATER TANK PRESSURE CALCULATIONS, we can re-examine the calculation of variation in water tank air volume in more detail using Boyle's Law.
I appreciate the thoughtful editing and that you took the time to comment.

When our water tank (at sea level) pressure gauge reads 50 psi, the true absolute pressure in the tank is (50 + 14.7) 64.7 psi. (This is not what happens in normal water pressure tank operation. So at However for the purpose of turning on a water pump, we don't care if the pressures are expressed as relative or absolute - we care about the pressure change inside the water pressure tank while water is being run. BOYLE's LAW at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

Book Description: Leviathan and the Air-Pump examines the conflicts over the value and propriety of experimental methods between two major seventeenth-century thinkers: Thomas Hobbes, author of the political treatise Leviathan and vehement critic of systematic experimentation in natural philosophy, and Robert Boyle, mechanical philosopher and owner of the newly invented air-pump. at the change in air volume). That is, when the pressure inside the pressure tank drops from 50 to 30 psi for an absolute pressure drop of 20 psi, the switch needs to turn on the pump. So to comply with Leviathan and the Air-Pump examines the conflicts over the value and propriety of experimental methods between two major seventeenth-century thinkers: Thomas Hobbes, author of the political treatise Leviathan and vehement critic of systematic experimentation in natural philosophy, and Robert Boyle, mechanical philosopher and owner of the newly invented air-pump. Now let's adjust our calculations to account for the normal operating range of a water pressure tank and water pump that


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