Yes. Unless the solid is either melting (and turning to liquid) or subliming (and turning to gas), it has fixed mass. Even if it is undergoing a transformation, the mass of substance is always constant, it may just change it's form or location...
Under normal conditions, platinum is a solid.
Under normal conditions (in a container or under ground) natural gas is a gas.
Cars are made from metal and is therefore Solid
Solid under standard pressure and temperature conditions (0 degree Celsius, 273 K, and 1 atm)
it is a solid at room tempretureGallium is a solid metal, but only under 30 0C.
Titanium is a solid under normal conditions.
Under normal conditions it is a solid.
Under normal conditions, platinum is a solid.
Under normal conditions, aluminum is a solid.
Under standard conditions terbium is a metal (it is a lanthanide)
No, under normal conditions it is a crystalline solid.
Under normal conditions of temperature and pressure the mineral Quartz is a crystalline solid.
No, sodium acetate is a solid under normal conditions.
It was thought to be a gas but may be a solid under normal conditions
Au, gold, is a solid under normal conditions, it melts at 1064 0C
Assuming by "normal conditions" you mean room temperature at sea level, pure calcium would be in a solid state.
Under normal conditions (in a container or under ground) natural gas is a gas.