(n.) A mineral of a white or a slightly bluish color, usually massive. It is anhydrous sulphate of lime, and differs from gypsum in not containing water (whence the name).
Example Sentences:
(1) The second shrinkage between 300 degrees C and 400 degrees C was due to the transformation of soluble anhydrite to insoluble anhydrite.
(2) However, the SEM observations of the fractured surface of compacts suggested that the second shrinkage corresponded to the grain growth of insoluble anhydrite.
(3) The third shrinkage beginning at the temperature range 700 degrees C approximately 800 degrees C is considered to be related to the sintering of insoluble anhydrite.
(4) The sintering kinetics of insoluble anhydrite were studied by measuring the isothermal shrinkage of compacts of insoluble anhydrite powders in air.
(5) The dehydration of gypsum (calcium sulfate dihydrate) was not completed until the initial stage of this large shrinkage was reached, but the phase transition of calcium sulfate anhydrite (III-CaSO4 to II-CaSO4) was the major cause for the large shrinkage.
Gypsum
Definition:
(n.) A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.
Example Sentences:
(1) Ten alginates and seven gypsum products were tested.
(2) It is recommended that manufacturers pay more strict adherence to the requirements of the ISO Standard with regard to the availability and recommendation of suitable compatible gypsum products, and also that perhaps the actual Standard should be modified to be more realistic in its demands, and more discriminatory in its evaluation procedure.
(3) The diffusive properties of alginate membranes prepared by the interfacial reaction of sodium alginate solution with gypsum substrates were studied.
(4) The tensile strength of a dental gypsum was measured indirectly using both the diametral and the double-punch tests.
(5) Radiation shielding tables were developed from the calculated transmissions through Pb, concrete, gypsum, steel, plate glass, and water, using a technique which eliminates the "add one HVL" rule.
(6) The use of alginate and a recently introduced modified gypsum product as investing media, as well as centrifugation of the pour resin into the flask, offer no significant advantages over the originally introduced procedure.
(7) And unlike beach sand, the sands here, made up of eroded gypsum crystals, do not get scorching hot in the sun and can usually be walked on in bare feet, even on the hottest days.
(8) The best way of sterilization is to make a gypsum model from the hydrocolloid impression and place it in the furnace for 30 min in 60 degrees C.
(9) The results show that the dosage of gypsum should be 10-20 grams, preferably ground to at least 60 mesh powder, the fine powder over 60 mesh is not to be pre-decocted, but the coarse powder of 40 mesh needs pre-decocting.
(10) The content of calcium ion Ca2+ in gypsum decoction has been determined with coordination titration.
(11) Gypsum produced only 5% and granular dusts none at all.
(12) The fibrous dusts (other than gypsum) resulted in a high incidence of mesothelioma (30 - 67%).
(13) In a small area (approximately 40 km2) against the mountains there is a concentration of over 20 large plants: oil refinery; iron and steel mill; fertilizer, cement, and gypsum production; coke kilns; and chemical, paint, and many other ancillary plants.
(14) Although the tissue conditioners generally exhibited higher deformations and lower gypsum compatibility than specified by ADA Specification No.
(15) Dehydration conditions similar to those employed in wet calcination of gypsum appeared to be produced under atmospheric pressure when NaCl was present.
(16) (4) Different gypsum products responded differently to bonding agents.
(17) of gypsum board, lead, and plate glass at this radiation level was 1.8, 0.020, and 1.3 cm, respectively.
(18) Part I of this study considered the ability of alginate and gypsum combinations to reproduce a line on a test block.
(19) The advantages of the halo-fixateur therapy compared against extension and immobilization in Minerva gypsum are that secondary correction of positioning is possible; that functionally disturbing and extended spondylodeses are avoided; that care of the polytraumatized patient is facilitated; that X-ray films are easy to assess; and that the period of hospitalization is greatly reduced.
(20) We used a profilometer to determine the roughness average, maximum roughness, and waviness of the dies, control, gypsum, and silicone test surfaces.