dimensionless quantity
quantity with no physical dimension
logarithmic unit
unit of measurement on a logarithmic scale
isoperimetric ratio
ratio defined for any simple closed curve
isentropic exponent
the negative of the relative pressure change per relative volume change at constant entropy; for an ideal gas equal to the ratio of specific heat capacities
rolling resistance factor
quotient of tangential and normal component of the force applied to a body which is rolling at constant speed over a surface
Academic Freedom Index
index number (scaled 0–1), and near-global dataset on several dimensions of academic freedom in different countries, published by Global Public Policy Institute since 2020 (index structure described in 2017)