Dictionary » H » Hydrometer



1. (Science: physics) An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc.

It is usually made of glass with a graduated stem, and indicates the specific gravity of a liquid by the depth to which it sinks in it, the zero of the scale marking the depth to which it sinks in pure water. Extra weights are sometimes used to adapt the scale to liquids of different densities.

2. An instrument, variously constructed, used for measuring the velocity or discharge of water, as in rivers, from reservoirs, etc, and called by various specific names according to its construction or use, as tachometer, rheometer, hydrometer, pendulum, etc.; a current gauge.

Origin: Hydro-, 1: cf. F. Hydrometre.

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Plant experiment

... is very general. You need to focus on one part such as water, sunlight, or soil conditions. Secondly, you can't meaure transpiration without a hydrometer so unless you have access to a very hightech lab I doubt that. You need to establish how are you going to your enviroment? Are you going ...

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by daniel.kurz
Wed Jun 14, 2006 2:05 am
Forum: Botany Discussion
Topic: Plant experiment
Replies: 4
Views: 2531

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