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Density is a property; density is important in any technology to evaluate materials.
they are used everyday in many items such as bags or components of electronics like the outside part of it
Harmful materials are substances that can cause damage to living organisms or the environment, such as toxic chemicals or pollutants. Useful materials are substances that have practical value or serve a useful purpose, like building materials or medicine.
It can be useful in flushing infectious materials away from a wound.
== == to gain limestone and other useful rocks to get useful materials/ make useful materials out of the produc you collect, for example you can get steel, cement , glass and concrete
The purpose of mining is to find and retrieve useful materials in the ground and bedrock.
It is useful to heat materials when attempting to change their physical properties, such as melting or shaping. However, it may not be useful to heat materials that are sensitive to heat and may degrade or become damaged, or when temperature control is crucial for the material's stability.
an resource
Sedimentary rock are made of materials that could show what lived where. Also they are the only rock to hold fossils.
Materials that have very low thermal energy and resistance are referred to as insulators. These materials are poor conductors of heat, which makes them useful for preventing heat transfer. Examples include wood, rubber, and plastic.
Why is any car useful? Your question makes no sense.
Boiling of materials like egg.