Question 1

What are the 7 SI base units?

Accepted Answer

The 7 SI base units are: meter (m) for length, kilogram (kg) for mass, second (s) for time, ampere (A) for electric current, kelvin (K) for temperature, mole (mol) for amount of substance, and candela (cd) for luminous intensity.

Question 2

How do you convert between metric prefixes?

Accepted Answer

Each metric prefix represents a power of 10. To convert, count the difference in powers. For example, kilo (10³) to milli (10⁻³) is a difference of 6, so multiply by 10⁶. 1 kilometer = 1,000,000 millimeters. Common prefixes: kilo (10³), centi (10⁻²), milli (10⁻³), micro (10⁻⁶), nano (10⁻⁹).

Question 3

What conversions do you need for physics class?

Accepted Answer

Common physics conversions include: length (meters, centimeters, millimeters, kilometers), mass (kilograms, grams), time (seconds, minutes, hours), velocity (m/s, km/h), force (Newtons, dynes), energy (Joules, calories, eV), pressure (Pascals, atmospheres), and temperature (Celsius, Kelvin, Fahrenheit).

Prefix	Symbol	Factor	Example
Giga	G	10&sup9;	1 GHz = 1,000,000,000 Hz
Mega	M	10&sup6;	1 MW = 1,000,000 W
Kilo	k	10³	1 km = 1,000 m
(base)	—	10&sup0;	1 m, 1 g, 1 s
Centi	c	10−²	1 cm = 0.01 m
Milli	m	10−³	1 mm = 0.001 m
Micro	μ	10−&sup6;	1 μm = 0.000001 m
Nano	n	10−&sup9;	1 nm = 0.000000001 m

Quantity	Conversion
Speed	1 m/s = 3.6 km/h = 2.237 mph
Force	1 N = 1 kg·m/s² = 0.2248 lbf
Energy	1 J = 1 N·m = 0.2388 cal = 6.242 × 10¹&sup8; eV
Power	1 W = 1 J/s = 0.001341 hp
Pressure	1 atm = 101,325 Pa = 14.696 psi = 760 mmHg
Temperature	K = °C + 273.15

Unit Conversions for Students

Most Used Conversions

Quick Reference: SI Metric Prefixes

Quick Reference: Common Physics Conversions

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