I made 2 rockets. The bigger one is 23 cm long  and it is made of a tube package of effervescent tablets and self-adhesive paper. The diameter of this rocket is 3 cm.

The smaller rocket is 13 cm long and it is also made of tube package of effervescent tablets and self-adhesive paper. The diameter of this rocket is 2 cm.

During the first test , I poured water (about 1/3 of both tubes’ volumes) and I put 1 big tablet into the larger rocket and 3 smaller tablets into the smaller one.

During the second test, I poured water (about  half of their volume) and I put 2 big tablets into the larger rocket 3 smaller tablets into the smaller one.

During the third test, I poured Cola (about 1/3 of their volume) and I put 1 big tablet into the larger rocket and 3 smaller tablets into the smaller rocket.

During the last (fourth) test,  I poured Cola again (about half of their volume) and I put 2 big tablets into the larger rocket and 3 smaller tablets into the smaller rocket.

Jakub Zaćmiński