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Mathematical Constants

Intriguing, ubiquitous, and at times mysterious, numerical constants set the allowable limits for all universal phenomena. Whether your questions involves π, Avogadro's number, Planck's constant, the atomic mass unit, or any of the other multitudes of immutable numbers used in science, this is the category where they should be asked.

500 Questions

Do electrons have the mass as protons?

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Protons are part of the nucleus, so they have less mass than the nucleus (except in the specific case of hydrogen, where the nucleus is a single proton so they have the same mass).

Electrons are much less massive than protons. It would take 1836 electrons to equal the mass of one proton.

Neutrons are very slightly more massive than protons, by just about the mass of an electron. They're close enough that they're generally treated as having essentially the same mass.

Newton's gravitation constant value?

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If you're talking about the Universal Gravitation than it is 6.67 x 10^-11

What did the Native Americans and Europeans trade?

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The English traded their guns with the Indians, in turn the Indians ended up just using the guns against their own Indian enemies rather then shooting down the English. I however do not know what the Indians gave back in return for the guns. Land maybe? no they did not trade there land the English stole it of them and put them into reserves they traded guns for coats and clothes

Atomic mass and mass number?

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Atomic mass is the number of protons present in the nucleus or number of electrons revolving around the nucleus in an atom .It is denoted by Z.

Mass number is the sum of number of protons and neutrons present in a nucleus in an atom .It is denoted by A.

Calculate the atomic mass of an element?

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By taking the wieghted averages of naturally occurring isotopes of that element. :)

What is the difference between universal gas constant and characteristic gas constant?

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The Universal gas constant is R is independent of the gas taken.. While the Characteristic gas constant depends on the mol. mass of the gas.... The Characteristic gas constant of a gas or a mixture of gases is given by the molar gas constant, divided by the molar mass (M) of the gas/mixture. R(Characteristic) = {R}/{M} Well,this is just the basic...u can relate them both to the Boltzmann constant.. Here are some of the standard values for both: Values of R Units 8.314 472(15) J K−1 mol−1 0.082057 46(14) L atm K−1 mol−1 RChar for dry air Units 287.058 J kg−1 K−1 ok,i guess this is it!Hope this clears it...

What is hydrogens atomic mass?

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1.0
It's 1.00794 It's 1.00794
It's 1.00794 It's 1.00794
1.001.
The atomic mass of hydrogen is 1.66x10-27 kg. It's relative atomic mass is 1. The RAM is 2 and 3 respectively in its isotopes, deuterium and tritium.
The atomic mass of hydrogen is 1.66x10-27 kg. It's relative atomic mass is 1. The RAM is 2 and 3 respectively in its isotopes, deuterium and tritium.
1.01

Which of these is known as Avogadro's number?

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It is the no.of particles in 1 mole of that Substance.

What is dimention of universal gas constant?

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In SI units J K-1 mol-1 (Joules/ Kelvin mol or Joules per kelvin per mol)

in some older chemistry text books they quote L atm K-1 mol-1 (liter atmospheres per degree kelvin per mol)

(see wikipedia "Gas constant" for a list of the dimensions in other systems of units)

How is the Kw constant developed?

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it is the concentration of H3O+ times the concentration of OH-

What element has 89 atomic mass?

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The element that has the closest mass to 89 is Yttrium(88.91).

What is a dielectric?

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In physics, a dielectric is an insulating (or very poorly conducting) material. The material can be solid, liquid or gaseous. When a voltage difference is applied to top and bottom of a cylinder filled with a dielectric, no current will flow inside the cylinder because, unlike metals, a dielectric has no free-or loosely bound-electrons that can drift through the material. Instead, electric polarization occurs. The positive charges within the dielectric are displaced minutely in the direction of lower voltage, and the negative charges are displaced minutely in the opposite direction. When the molecules constituting the dielectric are polar (like water molecules), the molecules will align in the field, thus contributing to the electric polarization. Inside the cylinder no net charge density will arise because the charges in adjacent volume elements cancel. However, at the top and bottom of the cylinder an uncanceled surface charge will appear, and this surface charge (positive at the low voltage side and negative at the high voltage side) will oppose the electric field associated with the voltage difference. Thus, the polarization of the dielectric reduces the electric field inside the dielectric. Dielectric material is characterized by an intrinsic property called relative permittivity, usually denoted by εr (formerly this was known as the dielectric constant). The relative permittivity describes the ease of the polarization of the material and determines the size of the surface charge densities at the top and bottom of the cylinder. The Coulomb force between two permanent electric point charges placed inside a dielectric medium is 1/εr smaller than it would be in a vacuum due to the polarization of the dielectric medium by the point charges. The quantity of electric energy stored per unit volume of a dielectric medium is proportional to εr. The capacitance of a capacitor filled with a dielectric is a factor εr greater than it would be in vacuum. Reference: http://en.citizendium.org/wiki/Dielectric
Dielectric is a substance that can transport electricity without conducting it.

What is the importance of your choice of units in expressing the value of the ideal gas law constant?

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If any other units are used, the value will be different.

--Depending on the units you chose the value of the constant differs

What is the difference between dissociation constant and equilibrium constant?

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Equilibrium constants aren't changed if you change the concentrations of things present in the equilibrium. The only thing that changes an equilibrium constant is a change of temperature.

The position of equilibrium is changed if you change the concentration of something present in the mixture. According to Le Chatelier's Principle, the position of equilibrium moves in such a way as to tend to undo the change that you have made.

What is dielectric constant?

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A dielectric is an insulating material that does not conduct electricity and is transparent to an electromagnetic field. Dielectric materials are used to separate conducting surfaces such as the plates inside a capacitor, wires inside transformers, electric cable conductors, and elsewhere in the electric industry where electrical separation of charged elements is necessary. The dielectric constant is a ratio of the capacitance of a capacitor in which a particular insulating material is the dielectric, to the capacitance of the capacitor in which a vacuum is the dielectric.

Atomic mass of tellurium?

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The atomic number of tellurium (Te) is 52.

The atomic weight of Te 127.60 grams per mole.

See the Web Links to the left of this answer for a periodic table with more information about this element!

Why are there variations in atomic mass?

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The isotopic composition of natural uranium is not absolutely identical in all ore samples; this is valid also and for other elements. The long geological evolution can influence the isotopic composition.

What is the atomic mass of aluminium?

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The atomic mass of Aluminium is 26.981539 amu

What is Relative dielectric constant for vacuum?

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YES IT IS. Any quantity which is ratio of two physical quantities having same unit is dimensionless. Dielectric constant is ratio of Permittivty of medium to the permittivity of free space. As Permittivity of medium and permittivity of free space both have same units(F/m ie Farad/meter) dielectric constant becomes dimensionless quantity

Which element has an atomic mass of 16.00?

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the element that has an atomic mass of 16.00 is sulfer.

What constant is equal to the ratio ofthe gas constant to the avogadro constant?

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The gas constant (R) makes both sides of the ideal gas equation (PV=nRT) equal. It is therefore called the proportionality constant in the ideal gas equation. The value of R is 8.314 J/mol˚K. If you divide the ideal gas constant by Avogadro's number you get R/NA=(8.314 J mol-1 K-1)/(6.022x1023 #of atoms mol-1)=1.38x10-23 J/(atoms x K) since the mol-1 terms cancel out. This value is the Boltzman constant (kb) usually expressed in units of J/K (energy/temperature) and it gives the average energy of a single atom or molecule at an absolute temperature T. Just multiply kb by T and you get energy in Joules.

What is the atomic mass of boron?

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8 the atomic number is 5

How many atomic mass do krypton have?

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47 neutron and 36 proton and 36 electron because its atomic number is 36.

What element has an atomic mass of 9.01218?

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Silicon has a Atomic Mass number (weight of protons and neutrons) of 28.09. Its actually 28.0855

The value of the gas constant is?

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Values of general gas constant are: (value dependant on units)

R = 0.08205746 [atm. ℓ.mol-1.K-1]

R = 8.314472 [Pa.m3.mol-1.K-1 or J.mol-1.K-1]

R = 1.99 [Cal.mol-1.K-1]