Selected Units · Chemistry Reference Tables (2025 Edition)
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The Selected Units table from the Reference Tables for Physical Science: Chemistry (2025 Edition) gives the symbol and name of each unit used on the exam. No standard depends on it in particular, but it is the place to check what a symbol stands for in a quantitative question, so it is listed with the standards that involve calculations, HS-PS1-9 and HS-PS3-1.
| Symbol | Name |
|---|---|
| atm | atmosphere |
| °C | degrees Celsius |
| g | gram |
| Hz | hertz |
| J | joule |
| K | kelvin |
| L | liter |
| m | meter |
| mol | mole |
| Pa | pascal |
| s | second |
What the units table shows
Eleven base units: the atmosphere and the pascal for pressure (related by 1 atm = 101.3 kPa), degrees Celsius and kelvin for temperature (related by K = °C + 273.15), the gram, the hertz, the joule, the liter, the meter, the mole and the second. Units built from these with a prefix (kPa, kJ, mL, nm) take the factors in Selected Metric Prefixes, and derived units such as g/mol, mol/L (M) and J/g·K are written out from the base units. The 2011 edition's Table D also named the quantity each unit measures and had a somewhat different list: it included the minute, hour, day and year, M for molarity, the atomic mass unit (u) and ppm, while atm, °C and Hz are new in the 2025 edition.
Regents Exam Questions
Released Regents questions that cannot be answered without this table, listed by exam. Each link opens the question with its answer key; the standard is the one the question assesses.
No released question has needed this table yet.