Fill in the Blanks Changes of state (simplified)Online version Introduction to the changes of state in english. Taken from https://www.youtube.com/watch?v=DE3LCPfP8N8 by Brittany Moore 1 Matter can be in states : form , form and form . Solid state is characterised by having a size and volume . Liquid state is characterised by having a size and fixed volume . Gas state is characterised by having a variable size and . Do you know how we can change from one state to another ? Changes in state happen after or heating matter . happens when matter changes from its solid form to liquid form , and happens after rising temperature . When we heat an ice cube , or we leave it at room temperature it melts . is the opposite of melting . Matter changes from liquid to solid form . It happens when we put water in the . is when matter changes from liquid to gas , after liquids are heated . For example when we water , it turns into water vapour . is the step from gas to liquid , and it happens when matter in gas state is cooled .