The science behind coffee rings. In cleaning the counters, I noticed a coffee spill that had dried. It had formed a dark ring, with almost no coffee stain in the center.
I wish this could've been around when I was homeschooling. For the first time in my life, I'm not worried about how I'll earn an income. I’m not here to convince you to check it out, but I want to share that this is a once-in-a-lifetime opportunity that might disappear early next year (2025). Below, you’ll find a few of the products that I create videos for, earning a commission each time someone buys from my video. If you want to make more money than you ever dreamed, head over to TikTok and explore the TikTok Shop for Creators (it is 100% free). This is my way of giving back. I want everyone who needs a miracle like this to know about it!
These experiments are from Robert Krampf - The Happy Scientist
Before we hit the road, we always do some housecleaning, so that things will
be neat when we get back home. In cleaning the counters, I noticed a coffee
spill that had dried. It had formed a dark ring, with almost no coffee stain
in the center. This reminded me of an article that I have read on the
science behind coffee rings, giving me the idea for this week's experiment.
You will need:
a light colored counter top
a little bit of coffee or tea
Put a few drops of coffee onto the counter in a place where they will not be
in the way. Wait about half an hour and then look at them carefully. What
do you see? Each drop now has a dark ring around the edge.
Let the drops continue to dry, observing them now and then to see what is
happening. Wait until the drops are completely dry. What do you notice?
The original dark ring is still there and even darker. The area inside the
ring has very little stain. Why?
You probably expected that the entire area would wind up with a fairly even
stain, instead of the ring that you got. Lets think about what happened?
The liquid part of the drop (water) began to evaporate. There was more of
this evaporation at the edges than in the middle. Why? Think about the
shape of the drop. In the center, the surface is flat. At the edge, the
surface curves down to the counter. There is more surface area in the part
of the drop at the edge than in the center. More surface area means more
evaporation. The contact between the drop and the counter gives a place for
the solid parts of the coffee to be deposited. This deposited coffee is what
formed the original ring that you saw.
The ring also gives the liquid coffee a rough spot to stick to. Water is a
very sticky substance, and it tends to cling to many things, including dried
coffee. Because it sticks to this ring, the drop does not get smaller as the
liquid evaporates. Instead of getting smaller, it gets shorter. Since the
drop continues to evaporate faster at the edges, more and more of the coffee
moves there, making the ring darker. At the end there is only a thin film of
coffee left inside the ring, which produces very little stain in the center.
When you finish, be sure to clean the counter. Otherwise, we might both get
into trouble for making a mess.
Free printables for multiplication, roman numerals, state capitals, parts of speech, and more.
Math exercises. Multiplication and roman numeral resources. Posters, charts, converters.
Quizzes including world capitals, presidents in order, the elements, state flags, and more.
Armour, castle games, recipes, quizzes, fashions, music, old world maps, medicine, and more.
Alphabet flash cards, printable high frequency words, and printable parts of speech chart.
Spanish numbers to 20 and the Korean alphabet. Printable flash cards and charts.
Science games and quizzes, posters, science experiments.
Free Experiment of the Week from Robert Kramp's Science Education Co.
Posters, printables, the Lifeboat Game, fifty states resources, quizzes.
Reading systems, flashcard, worksheet and test makers, game creators, percentage calculator, timeline template.
Grade school and accredited high school, online public schools, foundational phonics, more.
Stickfigure animations, build a web page and a website template for kids.
Printable guitar and keyboard charts, ukelele chords diagram.
Free books, posters, videos, software, kits, curriculum, courses.
We're finding the good out there and sharing it.
Easy extra money! Lots of info here.
Food intolerance, night flying wasps, and more.
Maille armor pictures, ninja and camouflage pictures, and more.
If you have comments, questions, or would like to report a broken link, please send an email to Cheryl at byclc@live.com
© 2000-2024 Nicholas Academy
site map | privacy policy | by CLC | Micro-Ways