← All parts of this equation

Equation 135 · Part 1 · The Bend an Elevator Cannot Fake

Symbol phi_,zz

ϕ,zz≈3.08×10−6/c2≈3.43×10−23 m−2\phi_{,zz} \approx 3.08\times10^{-6}/c^2 \approx 3.43\times10^{-23}\,\mathrm{m^{-2}}
ϕ,zz\phi_{,zz}

What this part means

phi_,zz is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Its job in the formula

phi_,zz is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

The passage around this formula

…radial magnitude of 3.08×\times10^{-6}\,s−2\mathrm{s^{-2}} , matching the standard geodetic free-air gravity gradient of about 3.086×\times10^{-6}\,s−2\mathrm{s^{-2}} , or 0.3086 milligal per metre, to three figures [ 15 ] . So ϕ,zz\phi_{,zz} ≈\approx 3.08×\times10^{-6}/c2c^2 ≈\approx 3.43×\times10^{-23}\,m−2\mathrm{m^{-2}} .

Read this part in the article →

Learn the underlying idea

A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

Open the illustrated subscripts: which member of a family? guide →

See this notation across published equations →

Sources cited in the surrounding passage

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