← All parts of this equation

Equation 8 · Part 6 · The Physical Plant: Power, Cooling, and Networks in an AI Datacenter

superscript

ρcp≈4180 kJ/(m3⋅K)\rho c_p \approx 4180\ \mathrm{kJ/(m^3{\cdot}K)}
superscript

What this part means

A raised number can be a power. When it is a label or bound, it selects a case or the upper limit of a sum; the formula’s structure distinguishes these uses.

Its job in the formula

A raised mark can be a power or an index. Its position and the surrounding notation determine which.

The passage around this formula

The following is my own worked calculation, using standard property values rather than any cited source. At around 27 °C and atmospheric pressure, air has ρ\rho cpc_p ≈\approx 1.17\ kJ/(m3⋅K)\mathrm{kJ/(m^3{\cdot}K)} ; liquid water has ρ\rho cpc_p ≈\approx 4180\ kJ/(m3⋅K)\mathrm{kJ/(m^3{\cdot}K)} . The ratio is roughly 3,600 to one. Rejecting 100 kW at a 15 K rise therefore requires about 5.7\ m3/s\mathrm{m^3/s} of air — near 12,000 cubic feet per minute, through a single rack aperture — or about 1.6\ L/s\mathrm{L/s} of water, which is a garden hose. There is no engineering cleverness that closes a factor of 3,600; the only levers are a larger Δ\Delta T or a larger duct, and both run out.

Read this part in the article →

Learn the underlying idea

An exponent tells how a base is used in multiplication. In x³, x is the base and 3 is the exponent: x³ = x × x × x.

Open the illustrated exponents: repeated multiplication and powers guide →

Sources cited in the article section

These citations provide research context; check each source for the exact claim it supports.