The public exhibition opens at the Orange Function Centre on Eyles Street at 11am and runs until 4pm.

There will be 40 interactive science exhibits, while presenters will hold fire in their hands, lie on a bed of nails and play with liquid nitrogen.

Tickets are available at the door for $6 for adults, $5 for children and $18 for families, while children under five are free.

The science circus will head to Bathurst the following day.