Take two first The same empty drink bottle with a little sand in it. Then align the two bottle caps and poke a few small holes with nails, then connect the two bottle mouths and tie them with transparent glue, so that the sand will flow into the other bottle through the small holes in the bottle mouth. Note that the flow rate of the sand depends on the size of the holes in the two caps.

Additional:

Materials: Two drink bottles (only one bottle cap is used), fine sand, sticky notes, tape, scissors, cardboardproduction process: (1) Remove the outer packaging of the beverage bottle, brush the beverage bottle clean, and empty the water.

(2) Cut the sticky notes into various shapes with scissors, paste them on the empty beverage bottles, and dress up the small bottles beautifully. \

(3) Use small scissors to cut a big hole in the mouth of a bottle cap.

(4) Put the fine sand into the beverage bottle and fill half of it.

(5) Connect the mouths of the two beverage bottles and seal them with tape.

(6) Finally, cut the cardboard to the width where the two bottle mouths meet, and then seal it with tape.

A beautiful hourglass is ready. Please give it a try!