We can test relative hardness by pressing one material into another, the softer material is indented. The scales for hardness are many and confusing, there is no agreed system of units.
Diamond is a very hard material, as no other common material can scratch it. Toughness is the amount of energy required to fracture a material. It is commonly the most confusing term for students, and the opposite may help here, which is brittleness. Toughness is a feature of materials with a large region of plastic deformation. Polymers, such as shoe soles, are commonly very tough - it would take you much effort to fracture one with a hammer. Steel is strong, but carbon fibre is stronger per unit mass.
There are plenty of words we throw around in everyday speech that take on different, much more specific meanings when they're used in a technical context. One place you'll find a bunch of them is in the realm of material science.
This fantastic primer video from Real Engineering highlights a few in particular: stiff, tough, strong, ductile, brittle, and hard. It's a great rundown for newbs, or refresher for anyone who hasn't seen Young's modulus in a while. Hard adverb With difficulty; as, the vehicle moves hard. Tough verb endure a period of hardship or difficulty. Hard adverb Uneasily; vexatiously; slowly. Hard adverb So as to raise difficulties. Hard adverb With tension or strain of the powers; violently; with force; tempestuously; vehemently; vigorously; energetically; as, to press, to blow, to rain hard; hence, rapidly; nimbly; as, to run hard.
Hard adverb Close or near. Hard verb To harden; to make hard. Hard noun A ford or passage across a river or swamp. Hard adjective of speech sounds. Hard adjective of prices of shares, commodities, etc. Hard adjective of wine harsh or sharp to the taste, especially because of tannin. Hard adjective strongly alcoholic; denoting a spirit rather than beer or wine.
Hard adjective of a drug potent and addictive. Hard adjective of radiation highly penetrating. Hard adjective of pornography highly obscene and explicit. Hard adjective of the penis, clitoris, or nipples erect. Hard adjective of a man having an erect penis. Hard adjective of a consonant pronounced as a velar plosive as c in cat, g in go.
Hard noun a road leading down across a foreshore. Popular Comparisons. Adress vs. Comming vs. Label vs. Genius vs. Speech vs. Chief vs. Teat vs. Neice vs. Buisness vs. Beeing vs. Amature vs. Lieing vs. Preferred vs. Omage vs. Finally vs. Attendance vs. Latest Comparisons Tubercule vs.
Glyptal vs. Tough as an adjective of questions, etc. Tough as an adjective material science :. The difference between Hard and Tough When used as nouns , hard means a firm or paved beach or slope convenient for hauling vessels out of the water, whereas tough means a person who obtains things by force. Hard as an adjective of material or fluid : Having a severe property; presenting difficulty. Examples: "This bread is so stale and hard, I can barely cut it.
Examples: "'hard evidence". Examples: "At the intersection, there are two roads going to the left. Take the hard left. Examples: "I got so hard watching two hot guys wrestle each other on the beach. Examples: "There is a hard ''c'' in "clock" and a soft ''c'' in "centre". Examples: "We need both a digital archive and a hard archive.
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