• Innovation of the design and construction of the heat engine.

• Suitability of the material of construction, used for designing the heat engine.

• The economic considerations of the design of the heat engine.

• Difference in height of the piston before and after the reaction.

• The chemistry knowledge (based on the reactions chosen from the list).

Tie Breaker: The heat lost to the surroundings will be taken into account, and the team with the least heat lost to the surroundings will be the winner.