Wisdom Wednesdays

Question 1

What material/s are erasable pen inks made of?

Answer 1

1. Liquid Rubber Cement: color is added to look like ink
2. Thermochromic ink: becomes clear when heated, ink appears when cooled

Question 2

How do color changing mugs (w/heat) work?

Answer 2

heat energy causes dye to have a slight change in structure –> absorb light differently = different color

Question 3

How do glow sticks work?

Answer 3

phenol (plastic tube) + glass vial (peroxide) = glow

Question 4

What does the number inside the “Recycling symbol” mean?

Answer 4

1 = PET/PTE (Polyethylene Terephthalate): water and soda bottles
2 = HDPE (high density polyethylene): milk jugs, household cleaner container
3 = PVC (polyvinyl chloride): plumbing pipes
4 = LDPE (low density polyethylene): squeezable bottles, trash bag
5 = PP (polypropylene): drinking straws
6 = PS (polystyrene): disposable plates and cups
7 = others

Question 5

What is laminated safety glass?

Answer 5

Polyvinyl butyral (PVB). a plastic film, between 2 pieces of glass to prevent glass shards flying everywhere by keeping it in place.