| Physical Constant | Symbol | Value |
|---|---|---|
| Acceleration due to Earth's gravity | g | 9.8 m/s2 |
| Coulomb's law constant | k | 9.0 x 109 Nm2/C2 |
| Elementary Charge | e | 1.6 x 10-19 C |
| Electron rest mass | me | 9.11 x 10-31 kg |
| Gravitational constant | G | 6.67 x 10-11 Nm2/kg2 |
| Proton rest mass | mp | 1.67 x 10-27 kg |
| Speed of light in a vacuum | c | 3.00 x 108 m/s |
| Speed of sound in air at STP | 331 m/s |
| Air | 1.00 |
| Alcohol | 1.36 |
| Corn Oil | 1.47 |
| Diamond | 2.42 |
| Glass, Crown | 1.52 |
| Glass, Flint | 1.61 |
| Glycerol | 1.47 |
| Quartz, Fused | 1.46 |
| Water | 1.33 |