An e-mail from Gary recalls an instrument using thermometers to determine humidity and wants to know what it is. It's called a sling Psychrometer and consists of two thermometers which are fastened ...

An e-mail from Herman asks about an instrument using thermometers to determine humidity and wants to know what it is. It's called a sling psychrometer and consists of two thermometers fastened onto a ...

A what? A sling psychrometer is a difficult word for a very simple tool. It dates back to the 1700s and is actually still used today! If it ain’t broke, don’t fix it. A Sling Psychrometer is a simple ...

This resource is suitable for weather topics for primary school learners. Have you ever felt hot and sweaty even when you haven't done any exercise? That might be because of humidity. But what is ...