Understanding US Therms to Electronvolts Conversion
The US therm (thm) is a natural-gas energy unit equal to 100,000 BTU, used for billing gas consumption. The electronvolt (eV) is a minute energy unit equal to the energy gained by an electron moving through a one-volt potential, about 1.602 × 10⁻¹⁹ joules, and is standard in atomic, nuclear, and particle physics. Converting therms to electronvolts spans an enormous range, from a household heating unit down to the scale of single particles, giving an astronomically large count.
Conversion Formula
To convert US Therms to Electronvolts, multiply by this factor:
Step-by-Step Example
Convert 25 US Therms to Electronvolts.
How to Convert US Therms to Electronvolts
Bridge a household gas unit down to particle-physics energies in one step.
- Record your value: Note the energy amount in US therms.
- Multiply by the factor: Multiply by 6.583569 × 10²⁶ electronvolts per therm.
- Keep scientific notation: The result is astronomically large, so use exponential form.
- Worked result: 25 therms × 6.583569 × 10²⁶ = 1.64589 × 10²⁸ electronvolts.
US Therms to Electronvolts conversion table
| US Therms (thm) | Electronvolts (eV) |
|---|---|
| 0 | 0 |
| 1 | 6.583569e+26 |
| 2 | 1.316714e+27 |
| 3 | 1.975071e+27 |
| 4 | 2.633427e+27 |
| 5 | 3.291784e+27 |
| 6 | 3.950141e+27 |
| 7 | 4.608498e+27 |
| 8 | 5.266855e+27 |
| 9 | 5.925212e+27 |
| 10 | 6.583569e+27 |
| 15 | 9.875353e+27 |
| 20 | 1.316714e+28 |
| 25 | 1.645892e+28 |
| 30 | 1.975071e+28 |
| 40 | 2.633427e+28 |
| 50 | 3.291784e+28 |
| 60 | 3.950141e+28 |
| 70 | 4.608498e+28 |
| 80 | 5.266855e+28 |
| 90 | 5.925212e+28 |
| 100 | 6.583569e+28 |
| 150 | 9.875353e+28 |
| 200 | 1.316714e+29 |
| 250 | 1.645892e+29 |
| 300 | 1.975071e+29 |
| 400 | 2.633427e+29 |
| 500 | 3.291784e+29 |
| 600 | 3.950141e+29 |
| 700 | 4.608498e+29 |
| 800 | 5.266855e+29 |
| 900 | 5.925212e+29 |
| 1000 | 6.583569e+29 |
| 2000 | 1.316714e+30 |
| 3000 | 1.975071e+30 |
| 4000 | 2.633427e+30 |
| 5000 | 3.291784e+30 |
| 10000 | 6.583569e+30 |
| 25000 | 1.645892e+31 |
| 50000 | 3.291784e+31 |
| 100000 | 6.583569e+31 |
| 250000 | 1.645892e+32 |
| 500000 | 3.291784e+32 |
| 1000000 | 6.583569e+32 |
What is the US Therm?
The US therm is a unit of heat energy used primarily in the natural gas industry to measure and bill the energy content of gas supplied to homes and businesses in the United States.
Definition
The US therm is defined as 100,000 British thermal units (BTU) based on the 59 °F (15 °C) BTU:
More precisely, the US therm equals exactly 105,480,400 joules (about 105.48 MJ). It should not be confused with the slightly larger UK therm, which is based on the International Table BTU and equals 105,505,585.257 J.
Origin and History
The therm entered use in the 20th century as gas utilities shifted from billing customers by volume to billing by delivered energy, since the heating value of natural gas varies with its composition. Combining "therm" (from the Greek thermē, heat) with a fixed BTU count gave a convenient billing unit roughly equal to the energy in 100 cubic feet of typical natural gas.
Law and Notable Facts
In the United States the therm is a legally recognized commercial unit for natural gas sales. Gas meters record volume in hundreds of cubic feet (ccf), which utilities multiply by a "therm factor" reflecting the gas's actual heat content to convert to therms for billing.
Real-World Examples and Conversions
- A typical US home uses roughly 500 to 1,000 therms of natural gas per year for heating, cooking, and hot water.
- 1 therm equals about 29.3 kilowatt-hours of energy.
- Burning 1 therm of natural gas releases approximately 105.5 MJ of heat, enough to run a 20 kW furnace at full output for about 88 minutes.
What is the Electronvolt?
The electronvolt is a small unit of energy used throughout atomic, nuclear, and particle physics to describe the energies of individual particles, photons, and chemical or nuclear reactions.
Definition
One electronvolt is the kinetic energy gained by a single electron accelerated through an electric potential difference of one volt:
Since the 2019 redefinition of SI units, this value is exact: 1 eV = 1.602176634 × 10⁻¹⁹ J, because the elementary charge is now a defined constant. Common multiples include the keV (10³ eV), MeV (10⁶ eV), GeV (10⁹ eV), and TeV (10¹² eV).
Origin and History
The unit arose in the early 20th century as physicists studied electrons and ions accelerated in vacuum tubes and early particle accelerators, where energy expressed in volts of accelerating potential was far more natural than joules. It became the standard energy scale as quantum and nuclear physics matured.
Law and Notable Facts
The electronvolt is accepted for use with the SI system though it is not itself an SI unit. Via mass-energy equivalence, particle masses are routinely quoted in eV/c²: the electron's rest mass is about 511 keV/c², and the proton's is about 938 MeV/c².
Real-World Examples and Conversions
- Visible-light photons carry roughly 1.6 to 3.3 eV each.
- Chemical bond energies are typically a few eV per bond.
- The Large Hadron Collider accelerates protons to about 6.5 TeV, or 6.5 × 10¹² eV, roughly 1.04 microjoules per proton.
Frequently Asked Questions
How many electronvolts are in one US therm?
One US therm equals about 6.583569 × 10²⁶ electronvolts, an astronomically large count because an electronvolt is a subatomic-scale energy.
How do I convert US therms to electronvolts?
Multiply the therm value by 6.583569 × 10²⁶ and express the answer in scientific notation.
How many therms equal one electronvolt?
One electronvolt is about 1.518933 × 10⁻²⁷ US therms, a vanishingly small fraction.
What is an electronvolt used for?
The electronvolt is the standard energy unit in atomic, nuclear, and particle physics, describing photon energies, binding energies, and particle collisions.
Why is the number so enormous?
Because a single electronvolt is roughly 10⁻¹⁹ joules while a therm is on the order of 10⁸ joules, converting between them spans about 26 orders of magnitude.
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Complete US Therms conversion table
| Unit | Result |
|---|---|
| Watt-seconds (Ws) | 105480400 Ws |
| Watt-minutes (Wm) | 1758007 Wm |
| Watt-hours (Wh) | 29300.11 Wh |
| Milliwatt-hours (mWh) | 29300110 mWh |
| Kilowatt-hours (kWh) | 29.30011 kWh |
| Megawatt-hours (MWh) | 0.02930011 MWh |
| Gigawatt-hours (GWh) | 0.00002930011 GWh |
| Joules (J) | 105480400 J |
| Kilojoules (kJ) | 105480.4 kJ |
| Megajoules (MJ) | 105.4804 MJ |
| Gigajoules (GJ) | 0.1054804 GJ |
| British Thermal Units (IT) (BTU) | 99976.13 BTU |
| Electronvolts (eV) | 6.583569e+26 eV |
| Ergs (erg) | 1054804000000000 erg |
| Foot-pounds (ft-lbf) | 77798350 ft-lbf |
| Tonnes of TNT (t-tnt) | 0.02521042 t-tnt |
| calories (cal) | 25210420 cal |
| Kilocalories (kcal) | 25210.42 kcal |