hardnesschart
nounUK /ˈhɑːdnəs tʃɑːt/
US /ˈhɑːrdnəs tʃɑːrt/
A hardness chart is a picture that shows how hard or soft different things are.
The teacher used a hardness chart to show that diamond is harder than chalk.
RELATED WORDS
OTHER MEANINGS
2. A reference table listing the hardness values of materials used in engineering.
The engineer checked the hardness chart before choosing the metal for the gear.
3. A chart comparing the firmness levels of mattresses or foams.
The store's hardness chart helped us pick a mattress that was not too soft.
4. A guide showing pencil lead grades from soft to hard.
According to the hardness chart, a 2H pencil is harder than an HB pencil.