instruction:
In this task the focus is on physical knowledge about the world. Given the provided goal task in the input, describe a process that would lead to the asked outcome. This process often involves physical motions with objects, such as moving them, arranging them in a certain way, mixing them, shaking them, etc. 
question:
How do you draw a coffin?
answer:
Using a piece of paper and a pencil, lightly trace the outline of a model coffin.


question:
Use the sun and a magnifying glass to start a fire.
answer:
On a sunny day, hold the glass above something that will burn easily.  Use a dry leaf of a piece of paper.  Move the glass so the suns rays focus on the paper.


question:
To substitute helium for balloons,
answer:

attach the balloons to the end of a bottle filled with vinegar and baking soda.