You can follow real-time price movements and trade in the direction you think the market is moving without having to purchase any physical product. One should look at :
The energies sector offers the trading of energy products, specifically crude oil and natural gas. Energies are innately volatile markets because of the direct impact world events can have on supply. Oil price is often seen as one of the main unit which determines the well-being of the global economy. Oil prices are also affected by shortage, oversupply and weather. These variables have a direct impact on pricing.