nilglasto lujvo

x1 (temperature) is the degree of heat of x2 (entity/substance) measured on scale x3 and remains constant/invariant under conditions x4.

See nilgla, stodi

In notes:

selnilglasto
x1 (entity/substance) has a constant/invariant temperature x2 measured on scale x3 under conditions x4.
ternilglasto
x1 (temperature scale) is the measurement system in which x2 (temperature) of x3 (entity/substance) remains constant/invariant under conditions x4.
velnilglasto
x1 (conditions/stimuli) are the factors under which x2 (temperature) of x3 (entity/substance) remains constant/invariant, measured on scale x4.