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Atheists who love Science!

A group for science enthusiasts of all types -- professionals, amateurs, students, anybody who loves science.

Members: 1583
Latest Activity: May 19

Whether you're a professional, a student, an amateur, an enthusiast, whatever! Lots of atheists love science. Might as well have a group for it!

Feel free to nerd out, link articles, talk about your favorite field of research, whatever!

The icon is from www.wearscience.com.


9/28/2008
I've been super busy with school this semester -- no time for Atheist Nexus, sadly!!
If anyone who's around here a lot wants me to toss them moderation privileges to run this group or anything, just send me (Sara) a message! Thanks!

11/14/2009
Removed ability to send mass messages to everyone in the group. At 1000+ members, that seems like asking for spam.

Offer still open if anyone active in the group wants moderation privileges, but it appears everything has been going smoothly with all kinds of great discussions without moderation. Fantastic! :)

Discussion Forum

Science Journals suffer large scale peer review fraud

Started by Ruth Anthony-Gardner. Last reply by Clarence Dember Apr 17. 1 Reply

Common sense talk about climate change

Started by Ruth Anthony-Gardner. Last reply by Michael Penn Apr 15. 2 Replies

Time goes both ways in the quantum world

Started by Ruth Anthony-Gardner. Last reply by tom sarbeck Apr 14. 1 Reply

Ebola Vaccine Very Promising

Started by Patricia. Last reply by Patricia Apr 10. 6 Replies

Wound Healing

Started by Patricia. Last reply by Joan Denoo Mar 14. 2 Replies

The Web is not the Net.

Started by Visvakarman Svetasvatara-Upanish. Last reply by Michael Penn Mar 14. 1 Reply

Science, information, and politics in the Anthropocene

Started by Ruth Anthony-Gardner. Last reply by Ruth Anthony-Gardner Mar 12. 3 Replies

Marburg and Ebola Viruses

Started by Patricia. Last reply by Patricia Mar 4. 2 Replies

Dog-human alliance edged out Neanderthals

Started by Ruth Anthony-Gardner. Last reply by Michael Penn Mar 4. 1 Reply

Climate Change Deniers.

Started by Visvakarman Svetasvatara-Upanish. Last reply by Ruth Anthony-Gardner Mar 4. 8 Replies

FDA hides fraud

Started by Ruth Anthony-Gardner. Last reply by Ruth Anthony-Gardner Feb 14. 4 Replies

3-D Vaccine

Started by Patricia Feb 11. 0 Replies

Vulnerable to science denial

Started by Ruth Anthony-Gardner. Last reply by Grinning Cat Feb 8. 1 Reply

Brain and Spinal Cord

Started by Patricia. Last reply by Joan Denoo Jan 18. 3 Replies

Comment Wall

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Comment by AtheistTech on December 12, 2011 at 2:53am

@Chris G    I think we are in agreement.

Density=Mass/Area

If the Density changes, then either the Mass or the Area or both change.

In the example of the freezing of half a glass of water, the water does not lose or gain any mass. The Mass stays the same, but the Density and Area change.

1kg/centimeter cubed (Density)=1Kg (Mass)/1 centimeter cubed (area)

In this 1/2 cup water example: If the Density changes to .5kg/centimeter cubed, the Mass will stay at 1kg, but the Area will change to something like 2 centimeters cubed.

.5 kg/centimeter cubed = 1kg/2 centimeters cubed or .5=1/2 The Mass doesn't change, but the Density does.

Comment by Chris G on December 12, 2011 at 2:40am

Check out this web site about rubber expansion.

Air in a tire expands because of friction therefore the tire expands that doesn't mean that the rubber expands. The above web site says that rubber contracts with heat as written below:

Whether a material expands or contracts when it is heated can be ascribed to a property of the material called its entropy. The entropy of a material is a measure of the orderliness of the molecules that make up the material. When the molecules are arranged in an ordered fashion, the entropy of the material is low. When the molecules are in a disordered arrangement, the entropy is high. (An ordered arrangement can be thought of as coins in a wrapper, while a disordered one as coins in a tray.) When a material is heated, its entropy increases because the orderliness of its molecules decreases. This occurs because as a material is heated, its molecules move about more energetically. In materials made up of small, compact molecules, e.g., the liquid in a thermometer, as the molecules move about more, they push their neighboring molecules away. Rubber, on the other hand, contains very large, threadlike molecules. When rubber is heated, the sections of the molecules move about more vigorously. In order for one part of the molecule to move more vigorously as it is heated, it must pull its neighboring parts closer. To visualize this, think of a molecule of the stretched rubber band as a piece of string laid out straight on a table. Heating the stretched rubber band causes segments of the molecules to move more vigorously, which can be represented by wiggling the middle of the string back and forth. As the middle of the string moves, the ends of the string get closer together. In a similar fashion, the molecules of rubber become shorter as the rubber is heated, causing the stretched rubber band to contract

Read more: http://wiki.answers.com/Q/Why_does_heated_rubber_expand#ixzz1gJ54OlRp

If you fill a cup half full of water and put it in the freezer you will see it expands. Ice takes up more volume making is less dense. It has less mass or density per volume. 

Sorry I'm not able to explain this in writing very well. I'm not a teacher.

Comment by AtheistTech on December 12, 2011 at 1:35am

Yes, the ship building site had a definition of density that is 100% true. So the ice at the bottom of a glacier has more atoms in a cubic centimeter than a cubic centimeter of ice at the top of the glacier. All true, but what I was saying is that a one cubic centimeter of water has the same mass as the resulting ice. 

I would agree with you if you said "Ice has less mass per cubic centimeter than water that's why it floats.: Or "Ice is less dense than water that's why it floats."  Not "Ice has less mass than water that's why it floats." 

What you said confuses me because I think there is not enough information in your sentence: Ice has less mass than water that's why it floats.

Comment by Chris G on December 12, 2011 at 1:18am

I'm familiar with mass and inertia, and a mass of people. 

Look up mass, weight, density, and volume under shipbuilding to see another definition.

Maybe this will help.

Comment by AtheistTech on December 12, 2011 at 12:44am

And now for the rubber myth (or should I say now for the truth about rubber):

http://answers.yahoo.com/question/index?qid=20080515082550AA748X1

Comment by AtheistTech on December 12, 2011 at 12:41am

I just found a better answer to the question: Does mass change when water freezes?

http://wiki.answers.com/Q/When_water_freezes_does_the_mass_change

Comment by AtheistTech on December 12, 2011 at 12:32am

@Chris G I quickly found this definition and it jives with what I know and sorry to say, it does not jive with what you know.

http://science.yourdictionary.com/mass

Comment by Steph S. on December 12, 2011 at 12:04am
Thanks Ruth!
Comment by Ruth Anthony-Gardner on December 11, 2011 at 11:29pm

Here's a more complete explanation of why water expands when it freezes. Wikipedia link

Comment by Chris G on December 11, 2011 at 10:51pm

Ice has less mass than water that's why it floats. Ice at the bottom of a glacier compresses from the ice above so has more mass that ice you would get out of your freezer. Think of a concrete hulled ship. Concrete has more mass than water, but because of the shape the mass per volume is less than water allowing it to float. 

Mass is weight-volume-density. Sorry, I haven't found a good web site to explain it yet.

I never though of it before, but rubber must expand as water does when it gets colder giving it less mass. As rubber gets hot - to the melting point is gets less porous.

 

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