Talk:Hydrometer

message: The section titled hydrometer used in an actual historical context 1854 contains text copied directly from the book "The Physical Geography of the Sea" (as noted by the contributor) but uses words like "I" and "us", which isn't the appropriate tone to use for an encyclopedic entry.  Could someone re-write the section?
Could be heavily pruned if you ask me. I would say most of the information in that section is totally irrelevant. Gamsarah 15:35, 29 October 2006 (UTC)
thread_title: Historical content section needs re-write

message: I'm confused by the use of the word weight in this article, does it mean mass? The article talks of grammes per cubic centimeter, but gramme is a measure of mass not weight.  Alun 07:17, 22 February 2006 (UTC)
thread_title: Weight-Mass?

message: I reverted this addition because it is rather confusing:
:A portable, electronic densitometer can determine the density of liquids by comparing the natural frequency of a drawn sample to that of pure water. The instrument compensates for temperature, and displays results in density, specific gravity, API degrees, Brix, % Alcohol, % H2SO4, Baume, Plato, Proof or a user-defined unit.
What is "the natural frequency of a sample compared to pure water"??? What's the difference between specific gravity and density? And the description is missing a rudimentary explanation of how it works - or it might be in the "natural frequency" which is unclear to me. Han-Kwang 18:03, 5 April 2007 (UTC)
thread_title: Electronic densitometer

message: Maybe you guys (whoever's editing this page) can make instructions to build one.  That would really help.  I remember when I had to do a project about hydrometers.  What a nightmare!
Thanks, 
Jetster (Jetsterjinx)  —Preceding unsigned comment added by 137.132.3.7 (talk) 13:24, 30 October 2007 (UTC)
thread_title: How to Build one

message: There's a rather slim and so-so article on aerometer which seems to exactly overlap with hydrometer.  Merge? Pdch (talk) 15:00, 19 January 2008 (UTC)
replies: text: I'm inclined to say delete. Googling turns up almost nothing except dictionary sites and pages for some sort of aircraft instrument used to track hours in flight. Mangoe (talk) 13:34, 3 February 2008 (UTC)
replies: text:  Merge: the term is used in physics (at least in my undergrad physics lab). Whmice (talk) 09:45, 21 January 2009 (UTC)
thread_title:  Aerometer 

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thread_title: [[WP:FOOD|WikiProject Food and drink]] Tagging

message: A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids; that is, the ratio of the density of the liquid to the density of water. Doesn't a actually hydrometer measure actual density? Most of the scales are defined with respect to a standard density of water, yeah... but it doesn't actually compare the density of the substance being measured with a sample of water; and the readings won't change with temperature based on changes in the density of water in that temperature [only with changes to the actual density of the substance as it expands] except in so far as the hydrometer itself expands. --Random832 (contribs) 01:05, 27 July 2008 (UTC)
replies: text:  I read that and wondered the very same thing. A hydrometer is based on the principles of buoyancy. Thus the proportion of the hydrometer floating above the surface has to do with the density of the two fluids (air could be approximated as a vacuum), the density of the hydrometer, the force exerted by gravity. So it could be said that a hydrometer measures the density of a fluid relative to the density of the hydrometer by measuring its buoyancy (proportion above and below the top of the liquid). But, as pointed out, the only aspect incorporating specific gravity with respect to water is the tendency for hydrometers to be graduated as such. So I think it is true, hydrometers measure the relative density but only relative to the density of itself. However it cannot be said they measure specific gravity (disregarding the gradation) since specific gravity is based on the density of a reference of which any given hydrometer is not unless it is designated a reference such as the kilogram mass. It should be worded clearly as to differentiate relative density as used in the principle and in how they are typically graduated. The density of the hydrometer will be slightly temperature dependent. If its enclosed in borosilicate glass, the density should decrease by only 0.1% with a 100°C increase in temperature (as calculated using volumetric coefficient of expansion). I'm surprised this has not been resolved in 10 years. Devon (talk) 05:20, 9 May 2018 (UTC)
thread_title:  Measuring relative density vs specific gravity 

message: How does a swing-arm hydrometer work? --Random832 (contribs) 01:13, 27 July 2008 (UTC)
thread_title:  Swing-arm hydrometers 

message: I have heard of a device that is quite similar to the hydrometer but measures the density of a sample placed in the bulb. In that application the sample was potatoes and the density depended on the starch content and thus related to ripening and the gastronomic quality. In order for this to work the bulb should be a cage or other device permitting the sample to be immersed in a standard liquid (typically water) and the sample quantity must also be standardised (typically a certain mass of potatoes) and the sample should of course be clean so that the potatoes are first washed. If someone knows more about this device, e.g. its name, please include it or link to that device!  —Preceding unsigned comment added by 90.239.105.50 (talk) 21:21, 18 July 2010 (UTC)
thread_title:  Potato ripening 

message: Please see Talk:Brix#Rename.3F for a discussion about a possible new article for Hydrometer scales. Biscuittin (talk) 09:33, 16 June 2009 (UTC)
thread_title:  Hydrometer scales 

message: This  says the instrument in the diagram is a hydrometer.  It has a fixed weight and variable volume of immersion due to the volume of the stem.  The historic areometer had a fixed volume and adjusted the weights like balancing a scale. And an aerometer seems to be either an instrument for measuring the density of gases, or a machine for ventilating mines. --Wtshymanski (talk) 13:39, 27 June 2011 (UTC)
thread_title: Neither areometer nor aerometer

message: "Aerometer" incorrectly redirects here, but I do not know how to fix it.
James K.
71.50.19.103 (talk) 07:35, 25 July 2011 (UTC)
thread_title:  Aerometer incorrectly redirects here 

message: I'm surprised that this article does not mention the hydrometer's use in measuring the specific gravity of freshwater or saltwater marine aquariums, especially considering that this is no doubt the most popular home-consumer use for the device.  — Preceding unsigned comment added by 76.110.212.12 (talk) 02:00, 18 August 2011 (UTC)
thread_title:  Use in Aquariums 

message: The first reference is a dead link, the second link is unreliable.
2602:306:2420:8780:5DB7:F5D:36F7:D2B4 (talk) 08:13, 26 November 2013 (UTC)
thread_title:  Incorrect References 

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thread_title:  External links modified 

message: The history section is a mess. The only reference to modern history claims (without giving a reference) that the hydrometer appears in the works of Jacques Alexandre César Charles, who was born in 1746, but a London instrument maker, John Clarke, was marketing hydrometers in 1725, when they were in use by the Excise authorities to measure the strengths of spirits, and there is extensive evidece of their use by brewers from the 1770s. Further, under 'saccarometer, it claims that Thomas Thomson invented the saccharometer. As he was only nine years old in 1784 when John Richardson published Statical Estimates of the Materials of Brewing, which introduced the term 'saccharometer', this cannot be correct. Zythophile (talk) 08:46, 6 April 2018 (UTC)
thread_title:  History section is a mess