| 单词 | porometer |
| 释义 | porometer|pɒˈrɒmɪtə(r)|
[f. Gr. πόρο-ς pore n.1 + -meter.]
An instrument for measuring the degree of porosity; spec. one for estimating the sizes of the stomata of leaves by measuring the rate at which air can be passed through them.
1911Darwin & Pertz in Proc. R. Soc. B. LXXXIV. 137 We believe that a much more intimate knowledge of the living stoma and its movements would be necessary to prove his contention..that ‘the regulatory function is almost nil’. With a view to testing the question we have designed an instrument which we propose to call a porometer. The idea is to estimate changes in the stomata by recording the change in the velocity of a current of air drawn through them in the living leaf. 1939Geogr. Jrnl. XCIV. 124 The effect of the continuous illumination of the arctic summer in the stomatal mechanism of leaves was studied by porometers. 1970Nature 25 July 377/2 The stomatal activity of fully hydrated..broad bean plants..was investigated using a recording porometer attached to the second mature leaves from the apex. 1975G. Anderson Coring iv. 77 The basic instruments [for core analysis] are the porometer for porosity measurements, the permeameter for permeability measurements, and the saturation retorts for saturation measurements. |
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