Teachers, save “At-home experiment: the science behind h…” to assign it to your class.

Watch NASA scientist Emily explain the science of how hot air balloons work. Then make a flying ghost! With a grownup's permission and help, gather these materials: -several tea bags (you may need to try this more than once for it to work) -scissors -markers (optional) -strainer with handle (optional, to catch smoldering flying ghost if necessary) -lighter Tip: make sure any ceiling fans are OFF, and there are no breezes where you will work. The tea bag must be able to stand upright for it to fly up, up, and away! Directions: 1. With a grownup's help, cut off the top part of the tea bag and empty the contents into the trash. 2. Optional: decorate your flying ghost (or hot air balloon) with markers. 3. Gently put your fingers into the cylinder-shaped tea bag to fill it out. 4. Stand the teabag upright. Again, make sure there are no breezes or quick movements so it stays UP. 5. Have a grownup light the top of the teabag on fire. Hold your breath;) 6. Watch it fly away! Or, try again if it did not. 7. Be ready to catch any smoldering pieces with the strainer, if needed. Click to share a of your experiment. Hit if you need to try it again in the same video. Share your observations during the experiment! Tap the to share with your teacher and family and to our class blog. Wonders: What temperature was the air in the room? What do you estimate the temperature was around the lighter? Why did the tea bag fly up (or why didn't it)? What else do you wonder about this experiment?