Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Help Keep Boards Alive. Support us by going ad free today. See here: https://subscriptions.boards.ie/.
If we do not hit our goal we will be forced to close the site.
Current status: https://keepboardsalive.com/
Annual subs are best for most impact. If you are still undecided on going Ad Free - you can also donate using the Paypal Donate option. All contribution helps. Thank you.
If we do not hit our goal we will be forced to close the site.
Current status: https://keepboardsalive.com/
Annual subs are best for most impact. If you are still undecided on going Ad Free - you can also donate using the Paypal Donate option. All contribution helps. Thank you.
https://www.boards.ie/group/1878-subscribers-forum
Private Group for paid up members of Boards.ie. Join the club.
Private Group for paid up members of Boards.ie. Join the club.
what colour is water(or does it have a colour)?
Comments
-
-
-
-
-
-
Advertisement
-
-
-
From The Book of General Ignoance, written by John Lloyd and John Mitchinson, the makers and producers of television show QI hosted by Stephen Fry. This show delves into the depths of information and research to inform people on matters that they take for fact and prove their ignorance wrong.
Page 126 of the Noticeably Stouter Edition of this book.
" Q. What colour is water ?
A. The usual answer is that it isn't any colour; it's 'clear' and 'transparent' and the sea only appears because of the reflection ok the sky.
Wrong. Water really is blue. It's an incredibly faint shade, but it is blue. You can see this in nature when you look into a deep hole in the snow, or through the thick of a frozen waterfall. If you took a very large, very deep white pool, filled it with water and look straight down through it. The water would be blue.
Edit
In large bodies of water like seas and lakes he water will usually contain a high concentration of microscopic plants and algae. Rivers and ponds will have a high concentration of soil and other solids in suspension. All these particles reflc and scatter the light as it returns the the surface, creating huge variations in the colour we see. It explains why you sometimes see a brilliant green Mediterranean sea under a bright blue sky."
( Couldn't be arsed writing out the other additional scone ce details that prove the point
)
Anyway, yeah water is blue.0 -
-
-
Advertisement
-
-
-
-
-
-
-
ScienceNerd wrote: »How come you can see light sources that aren't reflecting off anything? The sun, a lamp, fire?
Naaa, in fact light is the only thing that we can see; everything else is invisible as we need light to bounce of objects in order to perceive them
To answer your question, light isn't really invisible (no matter what QI says). A perpendicular beam of light of which no photons are falling on your retina will of course appear invisible. The example of a laser is usually given as it has a very hight degree of spatial coherence (doesn't spread out much as compared say to a lamp).
The sun though is not a 'perfect' light source and has a high spatial (and temporal) coherence. You can see it because your eye is getting in the way of the photons that it emits.0 -
-
-
-
Advertisement
-
-
-
That was my train of thought originally, it's times like these i wish I'd continued with physics!Naaa, in fact light is the only thing that we can see; everything else is invisible as we need light to bounce of objects in order to perceive themCake, and grief counseling, will be available at the conclusion of the test
0 -
-
-
Moderators, Science, Health & Environment Moderators, Social & Fun Moderators, Society & Culture Moderators Posts: 60,119 Mod ✭✭✭✭
Join Date:Posts: 59288
if anything the earth spinning reduces the affect of gravity(centrifugal force). Also, look at how another body such as a planet or moon can affect another, the moon affecting our oceans
F = G(m1 * m2)/(r^2)
can't believe i remeber that 0 -
-
-
-
Advertisement
-
Advertisement