On Friday 19th May NPL scientists visited Year 6 and Year 4 children at Heathfield Junior School.
The children made and then launched their own water rockets.
"Honestly, this was the best science lesson ever! I think one day I want to work at NPL."
The children learnt about solids, liquids and gases by looking at the properties of liquid nitrogen.
"I've never seen liquid nitrogen before. What an amazing substance with crazy properties"