A metal door can expand by up to 0.3% of its height and width in hot summer temperatures. If the door expands to more than the height or width of the door frame, it will not open or close properly.

Answer 1

To ensure that the metal door can still open and close properly during hot summer temperatures, we need to make sure that the expansion does not exceed the height or width of the door frame.

Let's consider an example:

- Let's assume that the metal door has a height of 2 meters and a width of 1 meter.
- To calculate 0.3% of the height, we multiply 2 meters by 0.003, which equals 0.006 meters.
- Similarly, to calculate 0.3% of the width, we multiply 1 meter by 0.003, which equals 0.003 meters.

Therefore, the metal door can expand by up to 0.006 meters (or 6 millimeters) in height and 0.003 meters (or 3 millimeters) in width before it will not open or close properly.

It is important to note that these measurements are approximate and may vary depending on the specific materials and conditions involved. Additionally, the door should be installed with enough clearance to allow for regular expansion and contraction.