Register to reply 
[Basic question] What are negative numbers? 
Share this thread: 
#1
Dec2212, 05:48 PM

P: 7

What are negative numbers? Have you even seen a negative number of chickens? i haven't. The idea is merely an abstraction of subtraction. An abstract idea doesn't have to have any physical significance at all, even if the idea was derived from physical things.



#2
Dec2212, 06:01 PM

Mentor
P: 18,036




#3
Dec2212, 08:33 PM

P: 350

And I am happy knowing that negative means down and positive means up. Or maybe the reverse if convenient :)



#4
Dec2212, 10:58 PM

P: 190

[Basic question] What are negative numbers?
After all, not only it has physical significance in basics, but the most complex concepts of physics such as quantum mechanics can only be 'thought' through math. For example most physicists admit that they don't understand the uncertainty principle, they just "read it" in formulas. [edit: Meaning not that it's 'abstract' in itself but that they are so convinced everything up to that point had a physical meaning that even something that goes further and they can't see the physical part, it should have a physical representation.] 


#5
Dec2312, 07:31 AM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 39,339

As I said in your other thread, all mathematics has any different physical applications. Mathematics is NOT physics and there does not exist a single "physical explanation" for any mathematical operation.



#6
Dec2312, 04:18 PM

HW Helper
PF Gold
P: 2,795

They are numbers counted or measured in the opposite direction. Usually a reference number can be matched to a reference point on a number line. A simple physical interpretation works for temperature. One of the temperature scales, Celsius, uses the freezing/melting point of water as zero degrees. We can often find or measure a temperature of some positive amount, and if we do, this is usually of a temperature at which water is not a solid (not frozen). We naturally assume these are positive values, to the right of zero on the number line. A NEGATIVE Celsius temperature value is one at which water is typically in the form of ice, and the number is to the left of zero on the number line, and the number is given a negative sign next to it.
Example: 5 degrees Celsius is colder than the freezing point o f water and this water would be ice. 4 degrees Celsius is cold, but water at this temperature will be liquid. 


Register to reply 
Related Discussions  
Simple question about nthroots of negative numbers  General Math  4  
Negative numbers?  General Math  11  
Basic Question: Positive and Negative Electrical Charge  General Physics  4  
A basic question about complex numbers  Precalculus Mathematics Homework  5 