# Thickness

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Related to Thickness: thickness gauge, Thickness planer

## thickness

[′thik·nəs]
(meteorology)
The vertical depth, measured in geometric or geopotential units, of a layer in the atmosphere bounded by surfaces of two different values of the same physical quantity, usually constant-pressure surfaces.

## Thickness

(geology), the thickness of a stratum (vein, lens) or complex of geological deposits (suite, stage, series, system, lava sheets). A distinction is made between the true thickness (t) measured by the length of a perpendicular between the roof and floor of a stratum and the thickness visible on the earth’s surface (s). The true thickness is determined by the formula t = s sin (δ + σ), where δ is the angle of dip of the stratum and σ is the angle of inclination of the earth’s surface. The thickness of each stratigraphic subdivision varies along the strike.

References in periodicals archive ?
Pearson's correlation was used to compare ultrasound thickness, histopathological thickness and the distance from the skin.
Measurement Site: The Probe was placed on the anterolateral side of the abdominal wall, higher to the iliac crest and at right angles to the midaxillary line while ensuring that the center of the transversus abdominis muscle was centered within the field of sight.18 Each measurement was recorded three times for rest, contracted and the average used for calculation of Percent change Thickness.18,19
Descriptive measurement of the mean [+ or -] SD for nasal skin thickness.
In a choroidal and macular thickness calculation repeated five times with n=29, if the probability of a type 1 error (a)=0.05, the partial Eta squared was 0.212 and 0.795, the correction for nonsphericity a was 0.25 and 0.446, the power was 75.47% and 100%, respectively.
Various methods are being used to assess and image the RNFL, including fundus photography, scanning laser polarimetry, Heidelberger retinal tomography(HRT) and optical coherence tomography (OCT).4 The OCT is a modern non-invasive imaging device which measures the peripapillary RNFL thickness in all quadrants in non-contact manner.5 The latest spectral domain optical coherence tomography (SD-OCT) provides high axial scanning resolution (2.00 dioptre, amblyopia, retinal and optic disc diseases, corneal disorders, strabismus, glaucoma, ocular hypertension and a previous history of ophthalmic surgery, both intraocular and refractive surgeries or ocular trauma were excluded.
Spectaralis OCT (Heidelberg, Germany) was used to calculate macular thickness. Single skilled consultant did all macular scans.
First, we performed a descriptive study and used the data from controls to calculate the reference values (in the form of thickness and volume percentiles) of each of the macular and papillary sectors of the grid.
Second, the macular choroidal thickness was measured manually, and new automated software will reduce the bias involved and the time required to obtain measurements of the macular choroidal thickness.
The males and females had almost similar means for soft tissue norms except for H angle, skeletal profile convexity and upper lip thickness. Upper lip thickness and basic upper lip thickness was statistically different between males and females (P < 0.001).
The pre devised proforma was completed by researcher endorsing subject's demography, ocular examination findings and RNFL thickness of peripapillary area.
Optical coherence tomography (OCT) is a non-invasive, non-contact device that measures retinal nerve fiber layer (RNFL) thickness, macular thickness, macular volume, and optic disc area.

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