The hardness of materials is relative. For example, rubber is harder than sponge but softer than iron, indicating that hardness depends on what the material is being compared to.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
The hardness of materials is relative. For example, rubber is harder than sponge but softer than iron, indicating that hardness depends on what the material is being compared to.