Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS
Rough Science Photo of the Rough Science cast
 Home | Death Valley | Scientists | Mike | Aerial Surveyor Diary - Day 1
Introduction
 
Series 4:
Death Valley
Rover
Communication
Spacesuit
Impact
Aerial Surveyor
Rocket
 
 
The Scientists
Director's Notes
Producer's Notes
Tune In
 
Series 1:
Mediterranean
Series 2:
Carriacou
Series 3:
New Zealand
 
About the Show
Discover More
Feedback
Site Map
 
spacer spacer spacer
Mike's Aerial Surveyor Diary Day 1 2 3

Day One

Well, my challenge this time is to make a carbon dioxide filter. For this I need some limestone. Heating limestone (calcium carbonate) at a high enough temperature drives off a gas called carbon dioxide, forming lime. When this is added to water it gives calcium hydroxide – a solution called limewater. When air that contains carbon dioxide is bubbled through limewater, the carbon dioxide is removed – it reacts with the calcium hydroxide to give calcium carbonate again.

Sounds easy enough, but the particular type of limestone round here needs a really high temperature to drive off the carbon dioxide. All I have is a small stove that I know will not give me the kind of high temperatures I need. Sure, there’ll be some lime formed, but enough for my purposes? Maybe – maybe not. I've little choice but to suck it and see.

The first batch of local limestone I try is hopeless. Hardly any conversion to lime at all. It takes several more trips out from the mine to find the right kind of limestone that will, at sufficiently low temperatures, give me the lime I need.

 

 


Mike filters carbon dioxide
Scientist Diaries

See how the rest of the team fared with this challenge:

Ellen
Iain
Jonathan
Kathy