Whitworth compressed steel is obtained when molten steel is subjected to a pressure of

Whitworth compressed steel is a special type of high-quality steel produced by applying pressure to molten steel during the solidification process.

This process removes air bubbles, blowholes, and internal imperfections, resulting in a more compact and uniform steel structure.

The key to this method is the application of high pressure while the steel is still molten.

The correct pressure applied in this process is 9 kg/mm².

Therefore, the correct answer is Option B: 9 kg/mm²