Grout is a dense substance that flows like liquid and hardens upon application. Made of water, cement, and sand, forming water-resistant seals. Distinguished from mortar by low viscosity and lack of lime. Contains higher water ratio than concrete for low viscosity
Countertops are raised, flat surfaces used in kitchens, bathrooms, and workrooms. Typically installed on cabinets at ergonomic heights for user comfort. Term "counter" used in British English for workspaces, "bench" elsewhere
'Material' and 'materials' both are plural forms of 'material'. 'Material' refers to abstract, uncountable ideas like reading materials. 'Materials' refers to concrete, countable nouns like building materials
Goods are tangible items like pens, while services are intangible activities like teaching. Production, distribution, and consumption of goods and services underpin economic activity. Consumption provides utility according to economic theory
First recorded in 13th-century China using shells, seeds, and sand bonded to parchment. Glass paper was invented in London in 1833 by John Oakey. Shark skin and Coelacanth scales were used as abrasives historically
Drywall is made of gypsum plaster and cellulose/fiberglass as main ingredients. Gypsum comprises 70-90% of drywall, providing fire-proof and sound-deadening properties. Cellulose/fiberglass content ranges up to 10% in paper facing. Joint compound contains calcium carbonate and talcum for smooth sanding