Mass and Weight · Unit Converter

Convert Electron Mass (rest) to Dram (apothecary/troy)

Convert electron mass (rest) to drams (apothecary/troy) instantly. 1 electron mass (rest) = 2.342989e-28 dram (apothecary/troy) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dram (apothecary/troy) to Electron Mass (rest) converter for the reverse conversion.

Written by Sunith Babu L, Ph.D., Lead Engineer Reviewed by Dr. Ashok Kumar K, Ph.D.
Mass and Weight category 2 min read Published Last reviewed Updated

Units explained

Scientific / Atomic

Electron Mass (rest)

What is a electron mass (rest)?

The electron rest mass is about 9.109E-31 kg.

Origin of the electron mass (rest)

The mass of the electron, the lightest charged elementary particle.

Where it is used

Atomic and particle physics.

When and where it was developed

Quantified after J. J. Thomson identified the electron in 1897.

Troy & Apothecary

Dram (apothecary/troy)

What is a dram (apothecary/troy)?

The apothecary (troy) dram equals one-eighth of a troy ounce, about 3.888 grams.

Origin of the dram (apothecary/troy)

From the apothecaries' system rooted in the Greek 'drachma'.

Where it is used

Historical pharmacy and medicine compounding.

When and where it was developed

Part of the apothecaries' system of weights used through the 19th century.

Electron Mass (rest) to Dram (apothecary/troy) conversion formula

Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.

The relationship between electron mass (rest) and drams (apothecary/troy):

1 me = 2.342989e-28 dr ap
1 dr ap = 4.268052e+27 me

To convert electron mass (rest) to drams (apothecary/troy), multiply the value in electron mass (rest) by 2.342989e-28. To reverse, multiply drams (apothecary/troy) by 4.268052e+27.

How to use this converter

Type a value into the calculator. The result in drams (apothecary/troy) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Dram (apothecary/troy) to Electron Mass (rest) converter for the reverse direction.

Step-by-step: convert electron mass (rest) to drams (apothecary/troy)

  1. Write down the value in electron mass (rest) (me).
  2. Multiply that value by the factor 2.342989e-28.
  3. The product is the equivalent value in drams (apothecary/troy) (dr ap).
  4. To reverse, multiply the dram (apothecary/troy) value by 4.268052e+27.

Worked examples

Example 1 — Convert 1 me to dr ap:
1 × 2.342989e-28 = 2.342989e-28 dr ap

Example 2 — Convert 100 me to dr ap:
100 × 2.342989e-28 = 2.342989e-26 dr ap

Real-world example — Sub-micron to millimeter

500,000 electron mass (rest) converts to a small everyday quantity in drams (apothecary/troy) — useful when relating optical-wavelength specifications to physical mounting hardware.

500000 me × 2.342989e-28 = 1.171495e-22 dr ap

Real-world example — From wavelengths to millimeter-scale objects

A value of one million electron mass (rest) sounds vast at the atomic scale but converts to a small everyday quantity in drams (apothecary/troy) — useful when relating optical-wavelength specifications to physical mounting hardware.

1000000 me × 2.342989e-28 = 2.342989e-22 dr ap

Electron Mass (rest) to Dram (apothecary/troy) conversion table

Standard reference values for converting electron mass (rest) to drams (apothecary/troy):

Electron Mass (rest) [me]Dram (apothecary/troy) [dr ap]
0.012.342989e-30
0.12.342989e-29
12.342989e-28
24.685979e-28
37.028968e-28
49.371958e-28
51.171495e-27
102.342989e-27
204.685979e-27
307.028968e-27
409.371958e-27
501.171495e-26
1002.342989e-26
5001.171495e-25
10002.342989e-25

Frequently asked questions

How many drams (apothecary/troy) is 1 electron mass (rest)?
1 electron mass (rest) equals 2.342989e-28 dram (apothecary/troy).
How do I convert electron mass (rest) to drams (apothecary/troy)?
Multiply the value in electron mass (rest) by 2.342989e-28 to get drams (apothecary/troy).
How do I convert drams (apothecary/troy) back to electron mass (rest)?
Multiply the value in drams (apothecary/troy) by 4.268052e+27, or use the Dram (apothecary/troy) to Electron Mass (rest) converter.
How many drams (apothecary/troy) is 100 electron mass (rest)?
100 electron mass (rest) equals 2.342989e-26 drams (apothecary/troy), because 100 × 2.342989e-28 = 2.342989e-26.

Convert Electron Mass (rest) to other weight units

Show all Electron Mass (rest) conversions
Metric / SI (18 units)
Electron Mass (rest) to Attogram (ag) Electron Mass (rest) to Femtogram (fg) Electron Mass (rest) to Picogram (pg) Electron Mass (rest) to Nanogram (ng) Electron Mass (rest) to Microgram (µg) Electron Mass (rest) to Milligram (mg) Electron Mass (rest) to Centigram (cg) Electron Mass (rest) to Decigram (dg) Electron Mass (rest) to Gram (g) Electron Mass (rest) to Dekagram (dag) Electron Mass (rest) to Hectogram (hg) Electron Mass (rest) to Kilogram (kg) Electron Mass (rest) to Quintal (metric) (q) Electron Mass (rest) to Metric Ton (t) Electron Mass (rest) to Gigagram (Gg) Electron Mass (rest) to Teragram (Tg) Electron Mass (rest) to Petagram (Pg) Electron Mass (rest) to Exagram (Eg)
Avoirdupois (15 units)
Electron Mass (rest) to Grain (gr) Electron Mass (rest) to Dram (avoirdupois) (dr) Electron Mass (rest) to Ounce (oz) Electron Mass (rest) to Pound (lb) Electron Mass (rest) to Clove (clove) Electron Mass (rest) to Stone (US) (st) Electron Mass (rest) to Stone (UK) (st) Electron Mass (rest) to Quarter (US) (qr) Electron Mass (rest) to Quarter (UK) (qr) Electron Mass (rest) to Hundredweight (US) (cwt) Electron Mass (rest) to Hundredweight (UK) (cwt) Electron Mass (rest) to Wey (wey) Electron Mass (rest) to Kilopound (kip) (kip) Electron Mass (rest) to Ton (short, US) (sh tn) Electron Mass (rest) to Ton (long, UK) (long tn)
Troy & Apothecary (10 units)
Electron Mass (rest) to Point (1/100 carat) (pt) Electron Mass (rest) to Carat (metric) (ct) Electron Mass (rest) to Scruple (apothecary) (s ap) Electron Mass (rest) to Pennyweight (dwt) Electron Mass (rest) to Momme (mom) Electron Mass (rest) to Mace (mace) Electron Mass (rest) to Dram (apothecary/troy) (dr ap) Electron Mass (rest) to Troy Ounce (oz t) Electron Mass (rest) to Tael (tael) Electron Mass (rest) to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Electron Mass (rest) to Ratti (ratti) Electron Mass (rest) to Masha (masha) Electron Mass (rest) to Tola (tola) Electron Mass (rest) to Chittack (Chatank) (chittack) Electron Mass (rest) to Seer (Ser) (seer) Electron Mass (rest) to Maund (Mann) (maund)
Scientific / Atomic (8 units)
Electron Mass (rest) to MeV/c2 (MeV/c²) Electron Mass (rest) to Muon Mass (mµ) Electron Mass (rest) to Atomic Mass Unit (u) Electron Mass (rest) to Proton Mass (mp) Electron Mass (rest) to Neutron Mass (mn) Electron Mass (rest) to Deuteron Mass (md) Electron Mass (rest) to Carbon-12 Atom Mass (C-12) Electron Mass (rest) to Planck Mass (mP)
Astronomical (4 units)
Electron Mass (rest) to Lunar Mass (Moon) (M☾) Electron Mass (rest) to Earth's Mass (M⊕) Electron Mass (rest) to Jupiter Mass (MJ) Electron Mass (rest) to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Electron Mass (rest) to Lepton (Biblical Roman) (lepton) Electron Mass (rest) to Quadrans (Biblical Roman) (quadrans) Electron Mass (rest) to Assarion (Biblical Roman) (assarion) Electron Mass (rest) to Gerah (Biblical Hebrew) (gerah) Electron Mass (rest) to Drachma (Biblical Greek) (drachma) Electron Mass (rest) to Denarius (Biblical Roman) (denarius) Electron Mass (rest) to Bekan (Biblical Hebrew) (bekah) Electron Mass (rest) to Didrachma (Biblical Greek) (didrachma) Electron Mass (rest) to Shekel (Biblical Hebrew) (shekel) Electron Mass (rest) to Tetradrachma (Biblical Greek) (tetra) Electron Mass (rest) to Mina (Biblical Greek) (mina) Electron Mass (rest) to Mina (Biblical Hebrew) (mina) Electron Mass (rest) to Talent (Biblical Greek) (talent) Electron Mass (rest) to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Electron Mass (rest) to Poundal (pdl) Electron Mass (rest) to Ton (assay) (US) (AT) Electron Mass (rest) to Ton (assay) (UK) (AT) Electron Mass (rest) to Kilogram-force square second/meter (hyl) Electron Mass (rest) to Slug (slug)

Sources & references

Conversion factor (1 me = 2.342989e-28 dr ap) verified against the following authoritative sources:

Results are provided for general reference. Verify critical measurements against an authoritative standard.