activator

Everyday

1. An activator is something that starts something working or makes it more active. tree →
2. In science, an activator is a substance that starts or speeds up a chemical change, like the hardener in some glues. tree →

In the lessons

In science and technology it is a word for whatever switches something on. In everyday life it appears on glue, paint and cleaning products. Phrases: glue activator, activator solution.

Examples

• Add the activator to the slime glue to make it thicken. tree →
• The alarm's activator is a small sensor by the door. tree →
• Some glue needs an activator to set hard. tree →
• The coach was the team's activator, always getting them moving. tree →
• Read the safety label before using the activator. tree →
• Sunlight acts as an activator for some reactions. tree →

Note

Countable. From activate (to make active) + -or. Related: active, activity, activation. Safety: activators in craft kits can irritate skin — follow instructions.