Rain Gauge Elicitation Question - My daughter Maia made this rain gage for her kindergarten class. Today, when the sun was high in the sky and the temperature around 70 we noticed that water drops had formed on nearly the entire inside surface of the 2L bottle. On closer inspection we saw that water drops had not formed around the areas where we had drawn a scale on the bottle with black permanent marker. When I asked the Luke and Maia to try to explain this observation a great discussion ensued including the following exchange:Maia (age 6) 'Maybe stuff in the lines from the pen pushes the water drops back.'
Luke (age 8) 'No. The writing is on the outside and the drops are on the inside. I don't think the chemicals in the ink could get through the plastic.'
Tankless Water Heater Elicitation Question - Why does a tankless water heater require less energy to operate than a standard storage tank water heater?
In the video below, the spokesman says, "Tank style water heaters produce standby energy losses because that water that has to be heated is in the tank and if it is not being used, there's an energy loss." What does he mean? Can't that hot water be used later?
No comments:
Post a Comment