Необхідно відтворити статтю «Make your own hot air balloon» із електронного видання журналу.
Текстові дані для виконання завдання надані у файлі «text.txt».
Положення та форматування тексту і малюнків має відповідати наданому зразку (файл «sample.png»).
Схеми частин повітряної кулі необхідно отримати за допомогою засобів текстового процесора.
Зображення повітряної кулі («Air-Balloon.png») повинно розташовуватись в правому нижньому кутку сторінки.
Try it! Make your own
HOT AIR BALLOON
Make your own hot air balloons and launch them from your school grounds. Although there is probably little risk of terrifying the local “peasants” with your “monsters”, it’s a good idea to get clearance from local authorities before you launch.
Assemble materials
24 sheets of tissue paper, various colors
Scissors
Glue
Masking tape
Thermometer
String and/or streamers cut from tissue paper
Small camp stove with fuel
Short section of stovepipe
Short ladder for standing while you read the thermometer
Heatproof mitts for handling the hot stovepipe
Fire extinguisher
Balance suitable for weighing the balloon assembly
Build it
Prepare a total of 8 panels of tissue paper by gluing together three separate sheets as show in (a).
Next, stack the panels and staple them together at the corners. Trim the stack of panels to make 8 “gores” with the dimensions shown in (b).
Hole for thermometer in one of the gores
Separate the gores. Glue each edge to a neighboring gore to form the balloon. Reinforce the open bottom edge with masking tape and attach several evenly spaced streamers and/or pieces of string to the bottom. These should increase the stability of your balloon.
Determine the mass of your balloon assembly
Do this if you are going to do the calculations your teacher may assign at the end of the activity. After the glue dries, gently fold the balloon. Either weigh it directly, or weigh it enclosed in a tared container.
Check for safety
Do this activity outdoors on a non-windy day, away from flammable materials. These directions are for supervised classes only. Have a fire extinguisher on site? And review instructions for using it. Wear heatproof mitts when handling the hot stovepipe.
Launch it
Record the outside air temperature at time of launch. These temperature readings are important for doing the calculations your teacher may assign.
Punch a small hole in the top section of the balloon, just big enough to lower a thermometer suspended on a string lignite a small camp stove and surround it with a few upended bricks.
Place your stovepipe section over the camp stove. Position the bottom of the balloon while it inflates with the warm air.
Try to adjust the heat to the heat to the point where the balloon just “hovers”, neither rising nor falling. Note this temperature. Then, increase the temperature a few more degrees, remove the thermometer, stand back, and let ‘er go!
Think about it
Assuming your balloon survives intact, try launching again with either a lower or higher initial launch temperature. What’s the effect of the temperature change on altitude?
Your balloon rises because it is an object at lower density than the air around it. Suppose you had “molecular snapshots” of the way air molecules were arranged inside and outside the balloon. How would they compare?
