metals are usually solid at room temperature
metal's_toughness is temperature_sensitive. metal is hard_substance. most_glass_at_room_temperature is hard_solid. almost_all_solid_metals is room_temperature. most_glass is solid_at_room_temperature. glass is amorphous_solid_at_room_temperature. solid_metal is metal. solid_metal is solid_object. solid_metal is solid. calcium is solid_at_room_temperature.