The pump pushes in the air we cannot see

We can't see the air—what will it do to the balloon? Let's watch closely; we'll soon find out. An empty balloon lies flat on the table. I fit the balloon's neck over the pump nozzle. With the first push, air goes inside. Though we can't see it, it takes up space in there. The pump pushes in the air we cannot see, and that air presses on the rubber wall, so the rubber stretches and the balloon grows— that push on the surface is called pressure. I push the pump again, slowly and gently. Another bit of air goes into the balloon. The rubber stretches more and more. The flat balloon is now almost round. Can we see the air? No, but we can see what it does to the balloon. The balloon grows rounder and keeps getting bigger. The air presses in every direction. So the whole rubber wall stretches. That's how the balloon takes on a round shape. The pump pushes in the air we cannot see, and that air presses on the rubber wall, so the rubber stretches and the balloon grows— that push on the surface is called pressure. Although we can't see the air, it really does press. That's why our balloon slowly grew.

Udara tak terlihat—apa yang akan dilakukannya pada balon? Mari kita amati; sebentar lagi kita akan tahu. Balon kosong tergeletak pipih di atas meja. Mulut balon kupasang pada ujung pompa. Pompa kutekan sekali; udara masuk ke balon. Walau tak terlihat, udara menempati ruang di dalam balon. Pompa memasukkan udara yang tak terlihat, dan udara itu menekan dinding karet balon, sehingga karet meregang dan balon membesar— dorongan pada permukaan itu disebut tekanan. Kupompa lagi, perlahan dan tenang. Sedikit lagi udara masuk ke dalam balon. Karet semakin meregang. Balon pipih kini hampir bulat. Bisakah kita melihat udara? Tidak, tapi kita melihat apa yang dilakukan udara pada balon. Balon makin bulat dan makin besar. Udara menekan ke segala arah. Maka seluruh dinding karet balon meregang. Begitulah balon menjadi bulat. Pompa memasukkan udara yang tak terlihat, dan udara itu menekan dinding karet balon, sehingga karet meregang dan balon membesar— dorongan pada permukaan itu disebut tekanan. Meski tak terlihat, udara benar-benar menekan. Itulah sebabnya balon kita perlahan membesar.