Mysteriously play an organ pipe without an organ! This demonstration uses heated air to produce vibrations inside a long tube. The vibrations, in turn, produce standing sound waves with a unique tone, or timbre (ta˘mʹ br)—the same concept that produces sound from an organ pipe.
The open tubes in this demonstration act in a similar manner to the flue-type organ pipe (see Figure 5). In a flue-type organ pipe, a stream of air is directed against a sharp edge in an opening of the pipe. The sharp edge creates turbulent, complicated swirls of air which set up vibrations in the air column.
The Wonder Wall fosters a community of wonder in an inquiry-based classroom. A prominent section of a classroom wall is devoted to the children’s questions. All questions are respected by being displayed on the wall. This helps children to feel safe as their wonders and theories emerge. Continue reading
What has the highest melting point known to us? Hank Green explains in this episode of SciShow.
This episode is brought to you by Audible. Continue reading