Skip to main content

Sound

I was standing outside just a moment ago because I forgot to bring my shoes in, and I noticed that I could hear sounds a lot clearer than on a warmer night. This intrigued me enough to think about what's going on. The simple explanation I could come up with is the air is a lot stiller, and there's less scattering going on. Colder air tends to be dryer too, so perhaps less water vapour to do the scattering. It's also denser, so the sound travels a bit faster.

Looking online, it turns out (I'm now too tired to think more deeply since I've been up since about 6 am today) that during cold nights, there is a layer inversion such that warmer air is above and colder air trapped below, this does make sense since warm air rises. This inversion traps sound waves and allows for the sound to travel farther and better horizontally. So no wonder I could hear conversations about half a mile away and the plane above sounded so loud, though it must be pretty darn high up. Cool huh?

Comments

Post a Comment

Popular posts from this blog

Youthful Reminisces

These past four days have been a trip down memory lane. I'm going to try to organize some of the memories for blogging, though not all in this post. My parents, M and I took a road trip to Hualien, partly as a family get-away, and also to introduce our Taiwanese hometown to a group of my brother's ( Albert Wu see here and here ) students from France. Albert and his wife are jointly teaching a course in history in Paris, and over the last few weeks they have been taking their students on an abroad research-coursework-fun tour of Taiwan. If you know my father, he tends to try to get involved in some way with any of his sons' projects, and from our perspectives, it's great to get his help and/or just advice (from time to time). My brother and his wife planned a historical, social justice introduction to Taiwan (I wrote about a visit to Dadaocheng ). Important components to understand the complex identities and mindsets of Taiwanese today involves understanding the Ea
Post a Comment
Read more

Did X say that?

I was cleaning out old draft emails when I came upon these quotes. 1. “Set your goals high; make friends with different kinds of people; enjoy simple pleasures. Stand on high ground; sit on level ground; walk on expansive ground.” 2. In everyone's life, at some time, our inner fire goes out. It is then burst into flame by an encounter with another human being. We should all be thankful for those people who rekindle the inner spirit . -Albert Schweitzer, philosopher, physician, musician, Nobel laureate (1875-1965) Both quotes resonated with me, and both quotes provide profound, provoking, prose projecting providence. But for the first quote I'm not sure who to attribute, and for the second, while I'd like to imagine he said that, I'm not really sure if Dr. Schweitzer did (because I have never met him!). In the internet age, I think it really behooves one to critically analyze everything read online. Does X make sense, did X say that? Sometimes it&
Post a Comment
Read more

Just a few more quotes to post and share!

See the post title. ***** If you want to build a ship, don't drum up people together to collect wood and don't assign them tasks and work, but rather teach them to long for the endless immensity of the sea. -Antoine de Saint-Exupery, author and aviator (1900-1945)    "No one wants to die. Even people who want to go to heaven don’t want to die to get there. And yet death is the destination we all share. No one has ever escaped it. And that is as it should be, because Death is very likely the single best invention of Life. It is Life’s change agent. It clears out the old to make way for the new. Right now the new is you, but someday not too long from now, you will gradually become the old and be cleared away. Sorry to be so dramatic, but it is quite true. Your time is limited, so don’t waste it living someone else’s life. Don’t be trapped by dogma — which is living with the results of other people’s thinking. Don’t let the noise of others’ opinions d
Post a Comment
Read more