 
 <prompt> Wetin be di alternative to artificial heat wey dey provide buoyancy? Based on di question wey dey above, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```A solar balloon na one black balloon wey dem fill with ordinary air. As sunlight dey shine on top the balloon, the air wey dey inside dey heat up and expand, wey dey cause am to dey rise up like how hot air balloon dey rise. Some solar balloons fit big reach make human fit fly inside, but e dey mostly use for toy market sake of say the surface-area to payload-weight ratio dey high.``` 