# Wat is the mass of a proton?

1. Jan 23, 2005

### hype_chicky

wat is the mass of a proton?

2. Jan 23, 2005

### Parth Dave

A simple google search will tell you. Just search for "Proton Mass". Google actually has it in their directory, so they'll tell you what it is: 9.10938188 × 10-31 kilograms.

3. Jan 24, 2005

### dextercioby

Bull****,that's the rest mass of an electron.

The mass of a proton is roughly $$1.67 \cdot 10^{-27} Kg$$

Daniel.

4. Jan 24, 2005

### Parth Dave

Yea, sorry for that mistake. For some reason i typed in electron instead of proton.... hmmm..... Anyways, dexterciobys answer is the correct one.

5. Jan 24, 2005

### theCandyman

Or to get a better idea of the size of an electron in comparison to other subatomic particles, it is $5.49\cdot10^{-4} amu$ and a proton is about $1.00727 amu$.

6. Jan 24, 2005

### Curious3141

Mass of proton = mass of hydrogen atom - mass of electron. :tongue2:

7. Jan 25, 2005

### dextercioby

According to Einstein,not really...The bond energy would have to be subtracted from the sum of the rest masses of the electron and proton...

Daniel.

P.S.Just like the nucleus case...

8. Jan 25, 2005

### vincentchan

and the bond state energy in this case is 13.6eV... compare with the mass of proton = 938.272 MeV/c^2, it is like 0.001 % error, compare with your answer = 1.67*10^-27 kg which has approximately 1% error, I think his answer is very good already (at least better than yours)

9. Jan 25, 2005

### dextercioby

Not really,the masses for the atom and the individual particles have an uncertainty too...

Daniel.

10. Jan 25, 2005

### vincentchan

Yes, you are right, In the Lab, the best we can get for the hydrogen's atom's mass has an uncertainty larger than 13.6eV/c^2, so we can completely ignore the bonding energy. thx remind me

11. Jan 25, 2005

### plusaf

did any of those answers work for you?

are you familiar with or have you used Google or other online or offline references to search for answers like the one you originally posted?

+af

12. Jan 25, 2005

### BobG

If you have a TI-86, just enter:

2nd CONS (selects the constants menu)
F1 (BLTIN) (which means built in constants)
MORE (you have more than 5 constants)
F4 (Mp) (which is mass of a proton)
ENTER

Mass of an electron (Me) and neutron (Mn) are also available.

I think the TI-83 has the same built-in constants.

13. Jan 26, 2005

### vinee

hahahahahahahha
i want to set it as the signature