Difference between petrol and Diesel engine

Describe difference between petrol and Diesel engine?

S.No	Petrol Engine	Diesel Engine
1.	Air petrol mixture is sucked in the engine cylinder during suction stroke.	Only air is sucked during suction stroke.
2.	Spark Plug is used.	Employs an injector.
3.	Power is produced by spark ignition.	Power is produced by comparison ignition.
4.	Thermal efficiency up to 25%.	Thermal efficiency up to 40%.
5.	Occupies less space.	Occupies more space.
6.	More running cost.	Less running cost.
7.	Light in weight.	Heavy in weight.
8.	Petrol being volatile is dangerous.	Diesel is non-dangerous as it is non-volatile.
9.	Pre-ignition possible.	Pre-ignition not possible.
10.	Works on Otto cycle.	Works on Diesel cycle.