I am a fundamental constant.

I have an exact value in terms of which certain SI units are now defined.

Yes✅

speed of light in vacuum

Leaderboard
Lillian > 3
X > 4
Lord Seventh > 1
Derrick > 1

Next one

I am a fluid-like substance.

I am neither liquid nor gas.

Yes✅

Plasma

Leaderboard
Lillian > 3
X > 5
Lord Seventh > 1
Derrick > 1

Next one

I am defined using limits, yet

I am not a limit.

I measure change, but I am not change itself.

Yes✅

Derivative

Leaderboard
Lillian > 3
X > 6
Lord Seventh > 1
Derrick > 1

chale my network no dey help me

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me den the X guy dey say am same buh sekof network he go come first