At room temperature (25°C), several substances can be solid, depending on their melting points and properties. Here are a few examples:
Iron (Fe): Iron has a melting point of 1,535°C, which is much higher than room temperature. Therefore, iron remains solid at 25°C.
Sodium chloride (NaCl): Common table salt, sodium chloride, has a melting point of 801°C. At room temperature, it is a solid crystal.
Paraffin wax: Paraffin wax is a commonly used solid material with a melting point typically ranging from 47°C to 68°C. At room temperature, it is solid and retains its shape.
Gold (Au): Gold has a relatively high melting point of 1,064°C, making it solid at room temperature.
Ice (H2O): Water freezes and forms ice at 0°C or below. Therefore, at room temperature, any ice present will be in its solid state.
The solid state of a substance at room temperature is determined by the intermolecular forces and the energy required to break those forces. Substances with strong intermolecular forces or high melting points tend to be solid at room temperature, while those with weaker forces or lower melting points may exist as liquids or gases.