Synonym: callosity, callousness, harshness, inclemency, insensibility, rigor, rigorousness, rigour, rigourousness, ruggedness, severeness, severity, stiffness, unfeelingness. Similar words: awkwardness, madness, sadness, kindness, wretchedness, harness, hard-pressed, wednesday. Meaning: ['hɑrdnɪs /'hɑː-] 
n. 1. the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale 2. devoid of passion or feeling; hardheartedness 3. the quality of being difficult to do 4. excessive sternness.
n. 1. the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale 2. devoid of passion or feeling; hardheartedness 3. the quality of being difficult to do 4. excessive sternness. 
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121. The highest degree of hardness reaches 456HV at higher flame intensity. The degree of hardness is related to the scanning rate of flame but not flame intensity.
122. The hydrogenation can be controlled to produce any degree of hardness desired in the product.
123. One common measure of minerals is water hardness, the sum of the dissolved calcium and magnesium.
124. After experimenting for eight days, he discovered that firing powdered graphite with clay would work, and the hardness of the pencil lead could be varied by varying the ratio of graphite to clay.
124. Sentencedict.com is a online sentence dictionary, on which you can find good sentences for a large number of words.
125. An investigation was made on brinell hardness test with a universal material testing machine.
126. Still commoner and no less repellent is the hardness which spoils so many pretty faces.
127. It ? ? s application tests showed that it was perfecter oligomer with flexility, weatherability, adhesion, hardness, abrasion resistance.
128. The test results shows that there is a linear relationship between Brinell Hardness and the machinability of cast iron with homogeneous microstructure or tiny carbides.
129. Research on HT250 gray iron flame welding with multi-alloying cast iron torch welding rods. Hardness, crack resistance and machinability of the welded joint is tested and analyzed.
130. The article introduces the method of superhardening treating hard alloy drawing die core with thermochemistry copermeation method so as to improve its surface hardness.
131. And in its transition zone, the hardness is remarkably reduced owing to the troostite precipitated.
132. Thirdly, Through Y-slit type cracking test and HAZ maximum hardness test the paper assesses the cold crack sensitivity of JB800 bainite steel.
133. B. Hardness Hardness is the dog's ability to recuperate from a disagreeable experience.
134. Bonding strength high ensure heavy bamboo slats inside and outside close-grained, surface of bright color, pure and fresh and elegant, bamboo grain clarity, elastic, high hardness and stable quality.
135. The experimental results on commercial pure titanium verify the obvious changes in the microstructure, hardness and wear resistance after laser solid diffusion treatment.
136. The influences of abrasive grain size, belt speed, contact roller's hardness, grinding depth and grinding feeding speed on surface roughness were discussed.
137. The mold hardness under different vacuum degree was tested. The results showed that the mold hardness of EPC process was higher than that of green sand mold and was more uniformly distributed.
138. Sapphire has a hardness of 9 on the Mohs scale and is also extremely tough.
139. The experimentation shows that hardness and wear show non linear relation. The rate of wear depends on many factors.
140. In this paper regression analyses for the relations between strength and hardness of chrome - Nickel - Molybdenum steel are carried out, the relevant formulas of the regression relations are set up.
141. High-quality chrome molybdenum steel forged, the overall hardness up to HRC52-55, mainly used for removal of broken bolt.
142. Compared with base metal, the microstructure in fusion zone is finer, and the hardness is higher. The hardness difference exists at various places in fusion zone.
143. The microstructure, phrase structure and hardness of the boriding layer were also discussed. The microstructure and properties of the boriding layer were studied.
144. A hardness came over Gudrun's face. She did not want to be too definite.
145. The first is the isotropy: the properties of homogeneous glass in all directions, such as refractivity, hardness, elastic modulus, coefficient of thermal expansion and so on are the same.
146. Hardness testing the depth and the trapezium of the carbonized layers and quench hardened layers.
147. With the merits of high hardness, high thermal conduction, negative electron affinity, diamond is deemed one of the preferred materials of the field emission cathode.
148. A look luxurious, high hardness, high decay resistance, anti-pollution features.
149. Table V: Analysis of variance for augmented central composite design model according to tablet hardness.
150. Composition, heat treatment state and micro - hardness test etc.
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