A gallon is the liquid volume measurement indicating tank size of a compressor

Galvanized is a term to describe thin Zinc plating applied to steel to resist corrosion when exposed to moisture

A gang iswidth of a junction box that holds one electrical device like a switch or outlet

A Ground Fault Circuit Interrupter  or GFCIis a shock prevention device that shuts off power if an imbalance of current flow is detected between the line and neutral wires

Glazing is a term used to describe the glass components of a window

Gloss is a term used to describe the highest sheen for paint which has more shine than semi-gloss

The grain of wood is the pattern of the tree growth rings as they show in a milled piece of lumber. Wood grain affects the strength of wood and follows the cellular structure of the tree which always runs the length of a cut lumber board.

Grit is thelevel of abrasion of the sandpaper surface – higher number means a finer smoother finish can be achieved and lower numbers produce a rougher finish

A ground wire is a safety conductor in a circuit identified by a bare copper or green colored insulated wire that can carry rogue current to earth in an emergency

A guardrail is ahorizontal protective member intended to prevent persons from passing beyond a given point on a scaffold system