H2SO4 is a strong acid, meaning it has a high level of acidity. Its pH is usually between 0 and 1. It is a colourless liquid that is highly soluble in water and other polar solvents. It is non-flammable and non-volatile. It has a strong Odour and can cause irritation and burns if it comes into contact with the skin or eyes. It is hygroscopic, meaning it absorbs moisture from the atmosphere.