Question

Answer the following questions:
1. What is an hour glass? What were its drawbacks?
2. What are the units to measure time?​

Answer 1

Answer:

1.The disadvantages of sand clock or hourglass are: The sand clock or hourglass had to be on flat surfaces every time so that it can work properly. It has a short duration of a clock probably less than one hour. The main difficulty is one can't see the time from this gadget accurately.

There are different units of time. Second, minute, hour, day, week, month and year are the units of time. These are the relations between units of time.

Answer 2

Answer:

Q2: second

Explanation:

time is measured in seconds