The difference between solid and liquid propellants are as follows
| Solid propellants | Liquid propellants |
|---|---|
| Solid propellants have low specific impulse | Liquid propellants have high specific impulse |
| Storage, handling and transport are comparatively easy. | storage, handling and transport are comparatively difficult. |
| Engines used have simple designs. | Engines used have delicate design and cannot withstand rough handling. |
| Economical in use. | Costly to use. |
| Manipulation of the fuel and calibration of the engine is difficult. | Fuel is versatile and engine calibration is easy |