Figure 4 - Instructor setting up the launcher. The launcher is set up to a certain degree, making sure the water rocket will launch as effective as it is intended to be. It is now ready to bring exceeding pressure on it
<a href="//commons.wikimedia.org/wiki/User:Joo_Nath" title="User:Joo Nath">Joo Nath</a>
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<span class="int-own-work" lang="en">Own work</span>