low electricity low elevation low elevations low elongation low emission low emission vehicles low emission zone low emissions low emissivity low employment low employment rate low end low energy low energy consumption low energy density low energy levels low energy prices low engine low enough low enriched low entropy low entry low environmental low environmental impact low error low esteem low estimate low estrogen low expansion low expectations low exposure low expression low failure low false low family low fan low fare low fares low fat low fat content low fat diet low fee low fees low female low fertility low fertility rates low fever low fiber low figure low financial low fire low fixed low flame low flash low floor low flow low flow rate low flows low fluid low flying low foam low foaming low food low for awhile low for now low force low forest cover low free low frequencies low frequency low frequency band low frequency response low frequency signal low frequency signals low frequency sound low friction low friction coefficient low friction surface low fuel low fuel consumption low gain low gas low gear low genetic low german low glass transition low global low gloss low glucose low glycemic low glycemic index low grade low grade fever low grades low gravity low ground low growl low growth low hand